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What does “err on the side of caution” mean?

Meaning, example sentence and a quick practice question.

C1

To choose the safer option when unsure

“When in doubt, err on the side of caution.”

Say it smoothly: “err-on-thuh-side-o'-caution”

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

Quick check

What does “err on the side of caution” mean?

Teaching this phrase?“err on the side of caution” 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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