to release a person (from sin, guilt, a promise, duty etc)

free from responsibility, duty

to cause (one machine part) to become detached

free from connection

to set (a person, people) free

give freedom

a prisoner's solemn promise that he or she will not repeat a crime

discharge

to get back (something), get possession of (something) again

pay blackmail money for return of possession or person

to make, keep, a person, thing safe (from loss, death, injury etc); (dated) except: 'all save him'; to free (a person) from the need of using (something)

rescue

to undo the hooks of (a dress etc)

give freedom

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

open; solve