1. In one side and out the opposite or another side of: went through the tunnel.
2. Among or between; in the midst of: a walk through the flowers.
3. By way of: climbed in through the window.
a. By the means or agency of: bought the antique vase through a dealer.
b. Into and out of the handling, care, processing, modification, or consideration of: Her application went through our office. Run the figures through the computer.
5. Here and there in; around: a tour through France.
6. From the beginning to the end of: stayed up through the night.
7. At or to the end of; done or finished with, especially successfully: We are through the initial testing period.
8. Up to and including: a play that runs through December; a volume that covers A through D.
9. Past and without stopping for: drove through a red light.
10. Because of; on account of: She succeeded through hard work. He declined the honor through modesty.
1. From one end or side to another or an opposite end or side: opened the door and went through.
2. From beginning to end; completely: I read the article once through.
3. 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.
4. Over the total distance; all the way: drove through to their final destination.
5. To a conclusion or an accomplishment: see a matter through.
1. Allowing continuous passage; unobstructed: a through street.
a. Affording transportation to a destination with few or no stops and no transfers: a through bus; a through ticket.
b. Continuing on a highway without exiting: through traffic; through lanes.
3. Passing or extending from one end, side, or surface to another: a through beam.
4. Having finished; at completion: She was through with the project.
5. Having no further concern, dealings, or connection: I'm through with him.
a. Having no more use, value, or potential; washed-up: That swimmer is through as an athlete.
b. Doomed to death or destruction.
through and through
1. In every part; throughout: wet through and through.
2. In every aspect; completely: a success through and through.
[Middle English thurh, through, from Old English thurh; see terə-2 in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.