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From The Collaborative International Dictionary of English v.0.48:
Unturned \Un*turned"\, a. [Pref. un- + turned.] Not turned; not revolved or reversed. [1913 Webster] To leave no stone unturned, to leave nothing untried for accomplishing one's purpose. [1913 Webster] [He] left unturned no stone To make my guilt appear, and hide his own. --Dryden. [1913 Webster]