To risk or sacrifice one's own life to save or help other people.

to sacrifice one's own interests or life for the sake of others; altruistic

(idiom) to give up one's private interests for the sake of the public or the state; to behave in a selfless and public-spirited manner

to give up one's own opinion or interests in order to follow others; to yield to the consensus

to abandon one's own ideas and follow the advice of others; to sacrifice one's own interests for the sake of others