in at one end, side, or surface and out at the other: to pass through a tunnel; We drove through Denver without stopping. Sun came through the window.
2.
past; beyond: to go through a stop sign without stopping.
3.
from one to the other of; between or among the individual members or parts of: to swing through the trees; This book has passed through many hands.
4.
over the surface of, by way of, or within the limits or medium of: to travel through a country; to fly through the air.
5.
during the whole period of; throughout: They worked through the night.
6.
having reached the end of; done with: to be through one's work.
7.
to and including: from 1900 through 1950.
8.
by the means or instrumentality of; by the way or agency of: It was through him they found out.
9.
by reason of or in consequence of: to run away through fear.
10.
in at the first step of a process, treatment, or method of handling, passing through subsequent steps or stages in order, and finished, accepted, or out of the last step or stage: The body of a car passes through 147 stages on the production line. The new tax bill finally got through Congress.
–adverb
11.
in at one end, side, or surface and out at the other: to push a needle through; just passing through.
12.
all the way; along the whole distance: This train goes through to Boston.
13.
throughout: soaking wet through.
14.
from the beginning to the end: to read a letter through.
15.
to the end: to carry a matter through.
16.
to a favorable or successful conclusion: He barely managed to pull through.
–adjective
17.
having completed an action, process, etc.; finished: Please be still until I'm through. When will you be through with school?
18.
at the end of all relations or dealings: My sister insists she's through with selfish friends.
19.
passing or extending from one end, side, or surface to the other.
20.
traveling or moving to a destination without changing of trains, planes, etc.: a through flight.
21.
(of a road, route, way, course, etc., or of a ticket, routing order, etc.) admitting continuous or direct passage; having no interruption, obstruction, or hindrance: a through highway; through ticket.
22.
(of a bridge truss) having a deck or decks within the depth of the structure. Compare deck(def. 16).
23.
of no further use or value; washed-up: Critics say he's through as a writer.
—Idiom
24.
through and through,
a.
through the whole extent of; thoroughly: cold through and through.
b.
from beginning to end; in all respects: an aristocrat through and through.
Origin: bef. 900; ME (prep. and adv.), metathetic var. of thourgh, OE thurh, c. G durch; akin to OE therh, Goth thairh through, OHG derh perforated, OE thyrel full of holes (adj.), hole (n.). See thirl
In one side and out the opposite or another side of: went through the tunnel.
Among or between; in the midst of: a walk through the flowers.
By way of: climbed in through the window.
By the means or agency of: bought the antique vase through a dealer.
Into and out of the handling, care, processing, modification, or consideration of: Her application went through our office. Run the figures through the computer.
Here and there in; around: a tour through France.
From the beginning to the end of: stayed up through the night.
At or to the end of; done or finished with, especially successfully: We are through the initial testing period.
Up to and including: a play that runs through December; a volume that covers A through D.
Past and without stopping for: drove through a red light.
Because of; on account of: She succeeded through hard work. He declined the honor through modesty.
adv.
From one end or side to another or an opposite end or side: opened the door and went through.
From beginning to end; completely: I read the article once through.
Throughout the whole extent or thickness; thoroughly: warmed the leftovers clear through; got soaked through in the rain; a letter that was shot through with the writer's personality.
Over the total distance; all the way: drove through to their final destination.
To a conclusion or an accomplishment: see a matter through.
adj.
Allowing continuous passage; unobstructed: a through street.
Affording transportation to a destination with few or no stops and no transfers: a through bus; a through ticket.
Continuing on a highway without exiting: through traffic; through lanes.
Having no more use, value, or potential; washed-up: That swimmer is through as an athlete.
Doomed to death or destruction.
Passing or extending from one end, side, or surface to another: a through beam.
Having finished; at completion: She was through with the project.
Having no further concern, dealings, or connection: I'm through with him.
Having no more use, value, or potential; washed-up: That swimmer is through as an athlete.
Doomed to death or destruction.
[Middle English thurh, through, from Old English thurh; see terə-2 in Indo-European roots.]
[throo] 
