make mind up
make up (one's) mind
1. To make a final decision after a period of consideration. Also seen as "make (one's) mind up." I've made up my mind, and I think we should move after all. I'm not sure what flavor I want—I'm still making my mind up.
2. To become convinced of a particular course of action. Also seen as "make (one's) mind up." Right then and there, I made up my mind that I would become a police officer when I grew up.
make someone's mind up
to decide; to do something that decides something for someone. Will you please make up your mind? I will help make up your mind.
make one's mind up (about someone or something)
to decide about someone or something. Please make your mind up about Ralph. Will you pick him or not? Make up your mind about her! I just couldn't make my mind up.