Select the most appropriate meaning of the given idiom.

Make up one’s mind

to decide

The most appropriate meaning of the idiom "make up one's mind" is to decide.

It means to come to a conclusion or to make a decision about something. The idiom is often used to describe someone who is trying to decide what to do or what to believe.

The other options are not correct.

• To achieve: This means to accomplish something.
• To lie: This means to tell something that is not true.
• To pretend: This means to act like something is real when it is not.