1) Become undone or untied 2) Cause to become undone 3) Detach 4) Disengage 5) Loosen 6) Open 7) Remove the chain from 8) To come unloosed or untied 9) To disconnect 10) Unbutton 11) Undo 12) Unknot 13) Unlock 14) Unravel 15) Unscrew 16) Untie 17) Unwrap 1) Detach 2) Loosen 3) Separate 4) Unbolt 5) Unchain 6) Unclasp 7) Undo 8) Unfix 9) Unlink 10) Unlock 11) Unloose 12) Untie 13) Unzip 
• (v. t.) To loose; to unfix; to unbind; to untie.
[v] - cause to become undone 2. [v] - become undone or untied
to release from or as from fastenings; detach. · to undo or open (something fastened).