to die in the line of duty

to die together in the name of love; to sacrifice oneself for love

to die for one's country

to die for one's religion

to be buried alive as sacrifice (together with husband or superior)

to sacrifice one's life by loyalty (to one's prince, one's husband etc)

(of servants etc) to be buried alive with the deceased; (of utensils etc) to be buried with the dead

to die for a just cause

to sacrifice oneself in a just cause; a victim of a disaster