leave no stone unturned

Fig. to search in all possible places. (As if one might search under every rock.) Don't worry. We'll find your stolen car. We'll leave no stone unturned. In searching for a nice place to live, we left no stone unturned.

to do everything possible in order to achieve or find something Both sides have vowed to leave no stone unturned in the search for peace.

to do everything that you can in order to achieve something or to find someone or something Both organizations have vowed to leave no stone unturned in the search for peace.

Make every possible effort, use every possible source or resource. For example, To raise ten thousand dollars to keep the shelter open, we must leave no stone unturned. This expression alludes to an ancient Greek legend about a general who buried a large treasure in his tent when he was defeated in battle. Those seeking the treasure consulted the Oracle of Delphi, who advised them to move every stone. The present form dates from the mid-1500s.

To make every possible effort.