make up one's mind

make up one's mind idiom
Decide between alternatives, come to a decision, as in I had trouble making up my mind about which coat I liked best. This expression dates from the early 1800s, although a similar usage appeared two centuries earlier in Shakespeare's King John (2:1): “I know she is not for this match made up.”

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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