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English definition of “second-guess”

second-guess

verb [T] uk   /ˌsek.əndˈɡes/ us  

second-guess verb [T] (GUESS)

to guess what someone will do in the future: She's always trying to second-guess the boss.

second-guess verb [T] (CRITICIZE)

US to criticize someone's actions or an event after it has happened: Of course it's easy to second-guess the management of the election campaign, but I do think serious mistakes were made.
(Definition of second-guess from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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