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From The Collaborative International Dictionary of English v.0.48:
Unfix \Un*fix"\, v. t. [1st pref. un- + fix.] 1. To loosen from a fastening; to detach from anything that holds; to unsettle; as, to unfix a bayonet; to unfix the mind or affections. [1913 Webster] 2. To make fluid; to dissolve. [R.] [1913 Webster] The mountain stands; nor can the rising sun Unfix her frosts. --Dryden. [1913 Webster]