'Unclutch' definitions:

Definition of 'Unclutch'

From: GCIDE

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]