Longman Dictionary of Contemporary English homepage

second-guess

 verb
     
second-guess [transitive]
1 to 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 English to criticize something after it has already happened:
The decision has been made - there's no point in second-guessing it now.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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