make up one's mind
- (idiomatic) To decide; to reach a conclusion.
I can't make up my mind whether to have ice cream or cake.
1909, Archibald Marshall [pseudonym; Arthur Hammond Marshall], chapter II, in The Squire’s Daughter, London: Methuen, OCLC 12026604; republished New York, N.Y.: Dodd, Mead and Company, 1919, OCLC 491297620:
- "I was dragged up at the workhouse school till I was twelve. Then I ran away and sold papers in the streets, and anything else that I could pick up a few coppers by—except steal. I never did that. I always made up my mind I'd be a big man some day, and—I'm glad I didn't steal."
to decide, to reach a conclusion