19
Dictionary entry pending editorial verification. Tap Listen to hear the word.
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
used before a singular noun to mean one of a group, when it is not a particular one
From this reading When trains have to go up or down a very long hill, the builders have a problem.
used to join words or parts of a sentence that go together
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
areauxiliary verbUS /ɑːr/
the form of “be” used with you, we, they, or a plural noun
From this reading The rails are laid so that they spiral upward, making a loop.
in or near a particular place or position
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
in or to or toward a former location
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
in the space, time, or range separating two things
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
buildersnounUS /ˈbɪldərz/
plural of “builder” — a substance added to soaps or detergents to increase their cleansing action
From this reading When trains have to go up or down a very long hill, the builders have a problem.
curvesnounUS /kɜːrvz/
plural of “curve” — the trace of a point whose direction of motion changes
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
being or moving lower in position or less in some value
From this reading When trains have to go up or down a very long hill, the builders have a problem.
from a particular thing or place or position (“forth” is obsolete)
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
change location; move, travel, or proceed, also metaphorically
From this reading When trains have to go up or down a very long hill, the builders have a problem.
in a gradual manner
From this reading They must slope the tracks very gradually.
haveauxiliary verbUS /hæv/
used with a past participle to form the perfect tenses
From this reading When trains have to go up or down a very long hill, the builders have a problem.
a local and well-defined elevation of the land
From this reading When trains have to go up or down a very long hill, the builders have a problem.
how
Dictionary entry pending editorial verification. Tap Listen to hear the word.
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
on condition that; in the event that
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
inside something, or within a place, period, or state
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
set down according to a plan
From this reading The rails are laid so that they spiral upward, making a loop.
primarily temporal sense; being or indicating a relatively great or greater than average duration or passage of time or a duration as specified
From this reading When trains have to go up or down a very long hill, the builders have a problem.
perceive with attention; direct one's gaze towards
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
loopverbUS /luːp/
move in loops
From this reading The rails are laid so that they spiral upward, making a loop.
the act that results in something coming to be
From this reading The rails are laid so that they spiral upward, making a loop.
thing or person that acts to produce a particular effect or achieve an end
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
plural of “mountain” — a land mass that projects well above its surroundings; higher than a hill
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
used to say something is necessary, or almost certainly true
From this reading They must slope the tracks very gradually.
touching and supported by a surface
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
used to mean any person in general, including the speaker
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
used to join alternatives or possibilities
From this reading When trains have to go up or down a very long hill, the builders have a problem.
one side of one leaf (of a book or magazine or newspaper or letter etc.) or the written or pictorial matter it contains
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
a visual representation (of an object or scene or person or abstraction) produced on a surface
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
a state of difficulty that needs to be resolved
From this reading When trains have to go up or down a very long hill, the builders have a problem.
railroadnounUS /ˈreɪlroʊd/
line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
railsnounUS /reɪlz/
a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll
From this reading The rails are laid so that they spiral upward, making a loop.
perceive by sight or have the power to perceive by sight
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
an elevated geological formation
From this reading They must slope the tracks very gradually.
for that reason; with the result that
From this reading The rails are laid so that they spiral upward, making a loop.
solvedadjectiveUS /sɑːlvd/
explained or answered
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
spiralnounUS /ˈspaɪrəl/
a plane curve traced by a point circling about the center but at increasing distances from the center
From this reading The rails are laid so that they spiral upward, making a loop.
used to introduce what somebody said, thought, or felt
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
used before a noun that is already known, already mentioned, or the only one of its kind
From this reading When trains have to go up or down a very long hill, the builders have a problem.
the people, animals, or things already mentioned, as the subject
From this reading They must slope the tracks very gradually.
used for a person or thing that is near, or that has just been mentioned
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
used before the base form of a verb to make the infinitive
From this reading When trains have to go up or down a very long hill, the builders have a problem.
tracksnounUS /træks/
plural of “track” — a line or route along which something travels or moves
From this reading They must slope the tracks very gradually.
trainsnounUS /treɪnz/
plural of “train” — public transport provided by a line of railway cars coupled together and drawn by a locomotive
From this reading When trains have to go up or down a very long hill, the builders have a problem.
being or moving higher in position or greater in some value; being above a former position or level
From this reading When trains have to go up or down a very long hill, the builders have a problem.
directed up
From this reading The rails are laid so that they spiral upward, making a loop.
precisely as stated
From this reading When trains have to go up or down a very long hill, the builders have a problem.
at the time that
From this reading When trains have to go up or down a very long hill, the builders have a problem.
having great (or a certain) extent from one side to the other
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
used to talk about the future, or about willingness
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
in the company of; together with
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
the person or people being spoken to
From this reading If you look back at the picture on page 19, you will see how one railroad solved the problem.
zagsnounUS /zæɡz/
plural of “zag” — an angular shape characterized by sharp turns in alternating directions
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
zig-zagadjectiveUS /ˈzɪɡzæɡ/
having short sharp turns or angles
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
zigs
Dictionary entry pending editorial verification. Tap Listen to hear the word.
From this reading In mountains this means that the tracks zig-zag back and forth, with long, wide curves between the zigs and the zags.
