Second-guess (verb)

To question or doubt a decision or action after it has been made or done.

Origin:

From "second" + "guess".

Examples:

1. He second-guessed his decision to quit his job.
2. She second-guessed her choice of outfit for the party.
3. I shouldn"t have second-guessed the doctor"s diagnosis.
4. He second-guessed himself and missed the opportunity.
5. She second-guessed her abilities and didn't try out for the team.