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to leave no stone unturned
01
to do everything one can in order to achieve a goal, particularly when it involves finding or looking for something
Exemple
He studied till all hours to prepare for the important exam, leaving no stone unturned in his preparation.
He left no stone unturned in his search for his natural mother.
The detective was determined to solve the case through and through, leaving no stone unturned.
The detective tirelessly investigated the highways and byways of the case, leaving no stone unturned in search of clues.
The journalist's panoptic report left no stone unturned, providing a complete picture of the events.