make up your mind
US /meɪk ʌp jʊər maɪnd/
UK /meɪk ʌp jʊər maɪnd/

1.
決める, 決心する
to decide which of two or more choices you want
:
•
I can't make up my mind whether to go to the party or stay home.
パーティーに行くか家にいるか、決められない。
•
It's time to make up your mind about which college you want to attend.
どの大学に行くか、決める時が来た。