leave no stone unturned
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- (idiomatic) To search or investigate thoroughly.
- 2021 August 25, Tassanee Vejpongsa, “Video sparks arrest of Thai police in drug suspect's death”, in The Washington Post, retrieved 2021-08-26:
- “This case of police torture and murder is shocking. But this is not the first case and it is unlikely to be the last case until and unless the police conduct serious interrogations and investigations and leave no stones unturned,” said Sunai Phasuk, a senior researcher for Human Rights Watch.
- (figuratively) To perform a task carefully and thoroughly, not missing any step.
- 1697, “The Second Book of the Æneis”, in John Dryden, transl., The Works of Virgil: Containing His Pastorals, Georgics, and Æneis. […], London: […] Jacob Tonson, […], OCLC 403869432:
- [He] left unturned no stone / To make my guilt appear, and hide his own.
- 2008 March 11, "Australia cancel tour of Pakistan", The Guardian (retrieved 2 May 2013):
- James Sutherland insists Australia had "no alternative" but to cancel the tour. "We have left no stone unturned in trying to ensure the tour could proceed as planned but at the end of the day the safety and security of our employees must come first."
perform a task thoroughly