do a flip-flop

To completely change one's opinion or stance. After the candidate did a flip-flop on that important issue, many voters felt they could not trust him to stick with one position. I used to hold a staunch view about the case, but then I did a flip-flop after hearing the other side's testimony. You can't do a flip-flop and withdraw your support now—our organization was counting on your generous donation!

See also:

flip-flop
change (one's) mind
change mind
change one's mind
change your mind
changed my mind
of little consequence
flip for
flip for (something)
(one's) day in court

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