to unfasten and take (something) apart

disconnect, cut off

to cause (one machine part) to become detached

free from connection

(to cause something) to become loose or looser

unbind

(of hair) loose, not tied; (of a book) without a cover

undo

to take the cork from (a bottle)

clear, expose; spread

of undo

open

to untie, unfasten, loosen (knots, buttons etc); to destroy (something good) and bring back the (bad) state of affairs that existed before

open

to use a key to open a lock on (a door, cupboard etc)

open; solve

to remove a screw or screws from (something)

set free; unbind

to unfasten (a knot etc)

unlace

to unfasten or open (clothes etc) by pulling a zip

open