to cause (one machine part) to become detached

free from connection

to separate or be separated

separate, disconnect

to set (a person) free (especially politically)

set free

to set (a person, people) free

give freedom

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 undo the hooks of (a dress etc)

give freedom