second-guess

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second-guess

1. To try to anticipate how something will happen or what someone will do. Trying to second-guess the outcome of a game in progress is exhausting.
2. To question or doubt someone or something retroactively. Why are you second-guessing me now? You agreed with this course of treatment just yesterday! I made the best decisions I could with the information I had at the time, so please don't second-guess me.

second-guess someone

to try to predict what some person will do before it is known to anyone, including the person. There is no point in trying to second-guess Bob. He is completely unpredictable.