字面意思是“不留下任何一块没被翻动过的石头”。形容为了寻找某物或解决某个问题，动用了所有的资源，不放过任何一丝线索。

• The police promised to leave no stone unturned in their search for the missing child. ^{警方承诺将竭尽全力寻找失踪的孩子。}
• We will leave no stone unturned to find the cause of the problem. ^{我们将不遗余力地寻找问题的原因。}
• The lawyer left no stone unturned while preparing for the case. ^{律师在准备这个案子时想尽了一切办法。}