to cause (a marriage agreements, a law etc) to exist no longer

void an agreement

to set (a person, oneself) free (from being held, from an unwanted responsibility etc)

get out of a situation; relieve of responsibility

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