To leave no stone unturned is to search absolutely everywhere. We will leave no stone unturned.
It is a promise of thoroughness and is nearly always made in public by somebody in charge. The phrase is very old and comes from a Greek oracle about finding buried treasure.
1phraseleave no stone unturnedTo search absolutely everywhere.
“The inquiry promised to leave no stone unturned.”
leave no stone unturned is a phrase.
Practised in Idioms