1. To have penetrated or crossed to the other side of something: Once you've pushed on it, the tack should be through the cloth, and it will stay attached.
2. To have finished something: You started that book yesterday; are you through yet? I was through with my homework, so I went out and played.
3. To be finished: Once this ironing is through, I'll be able to join you for coffee.
4. To have ended a romantic relationship, especially on a bad note: I hate to say it, but Chris and I are through.
5. be through with To have ended, or to desire to end, a relationship or engagement with someone or something: She said she was through with me and walked out the door. I am through with this awful job.
See also: through