Learn what "he left no stone unturned after richard disappeared" means, when people say it, and how to use it naturally in English.

It means someone tried every possible method to find information or solve a problem.
From Why I Did It, Episode 16
The speaker says someone searched thoroughly after a disappearance.
Use this to describe a very thorough search or investigation. The idiom is useful, but this line is too tied to a specific story context for indexing.
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