leave no stone unturned

make every possible effort

• The investigators left no stone unturned in their search for evidence.
• She promised to leave no stone unturned in finding a solution to the problem.
• The team left no stone unturned to ensure the event was a success.

This idiom is used to emphasize making a thorough effort to find a solution or achieve a result. It is heard in both formal and informal contexts and is common in both speech and writing. It is often used in motivational speeches and situations requiring intense dedication.

A common mistake is to mix up the word order and say 'leave no unturned stone'. This does not respect the fixed order of the expression and sounds incorrect to native speakers.

• the writing on the wall
  clear signs of impending failure or change
• throw caution to the wind
  act recklessly, abandoning prudence
• wrap your head around (something)
  manage to understand something difficult
• pull the rug out (from under someone)
  suddenly remove support, undermining someone