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From The Collaborative International Dictionary of English v.0.48:
Unclutch \Un*clutch"\, v. t. [1st pref. un- + clutch.] 1. To open, as something closely shut. "Unclutch his griping hand." --Dr. H. More. [1913 Webster] 2. (Mech.) To disengage, as a clutch. [1913 Webster]