Webster's Revised Unabridged Dictionary · 1913

Unfix

Unfix , transitive verb

[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.
2.
To make fluid; to dissolve. [Rare]
The mountain stands; nor can the rising sun Unfix her frosts. — Dryden