second-guess

Second guess means to question a decision or action that has already been completed. (verb)

An example of second guess is when you make a decision and then you start to think about it a little more and decide another decision might have been better.
An example of second guess is when a friend does something and then you suggest that maybe a different course of action should have been pursued.

See second-guess in Webster's New World College Dictionary

See second-guess in American Heritage Dictionary 4

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