verb: to do or perform (something very negative, like a crime)
Michiko committed too many grammar errors in her essay, and that hurt her score.
verb: to promise; to make a final and unchangeable decision
Before you commit to a university, be sure to spend some time on campus.
verb: (usually "be committed to") to give all of your energy to something
I'm completely committed to our baseball team's success; I'd do anything to win.