un·fix \|ən+\transitive verb Etymology:un- (II) + fix 1.: to loosen from a fastening : detach from something that holds < unfix the flagpole > : disengage < unfix bayonets > 2.: to make unstable : unsettle, unhinge < unfix the mind > < a new discovery that unfixed all established notions > 3.: to make (a chemical compound) soluble : dissolve