From Longman Dictionary of Contemporary Englishsecond-guessˌsecond-ˈguess verb [transitive] 1 PREDICTto try to say what will happen or what someone will do before they do it I’m not going to try and second-guess the committee’s decisions.2 American EnglishCRITICIZE to criticize something after it has already happened The decision has been made – there’s no point in second-guessing it now.→ See Verb table
Examples from the Corpus
second-guess• It's no use second-guessing his decision to sell the company.• I just couldn't get the ball past him; he second-guessed me every time.• Second-guessing the bank's next move in the takeover bid proved very difficult.• She was trying to second-guess which card Jeff would play next. 