Learn the tone, meaning, and better English alternatives around "we shouldn't leave any stone unturned" with real scene examples.

It means to investigate as thoroughly as possible and not overlook any detail.
From School Hall, Episode 28
The speaker urges the group to search thoroughly and not miss anything.
Use this in serious search, research, or investigation contexts when you want full effort. It sounds formal and a bit idiomatic, so learners should avoid it in very casual speech.
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