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What does “second-guess yourself” mean?

Meaning, example sentence and a quick practice question.

C1

To doubt a decision you've already made

“Try not to second-guess yourself once you've decided.”

From the C1 lesson On the Fence (decision idioms).

Quick check

What does “second-guess yourself” mean?

Teaching this phrase?“second-guess yourself” is part of a ready-to-teach lesson, with a reading, three exercises, speaking tasks and an answer key, in Everyday English Chunks C1 Pack 4 (Communication, Decisions and Habits).
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