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second–guess

1 ENTRIES FOUND:
second–guess /ˌsɛkəndˈgɛs/ verb
second–guesses; second–guessed; second–guessing
second–guess
/ˌsɛkəndˈgɛs/
verb
second–guesses; second–guessed; second–guessing
Britannica Dictionary definition of SECOND–GUESS
[+ object]
US : to criticize or question the actions or decisions of someone
: to try to guess or predict what (someone or something) will do

— second–guesser

noun, plural second–guessers chiefly US [count]