(idiomatic, colloquial, chiefly US) Be attractive, outgoing (typically of women).

(idiomatic) To strike or bump one's own head with a strong blow, especially with concussive force.

(formal) In place of someone or something.

(idiomatic, usually preceded by a) Harsh treatment inflicted on one who previously inflicted similar or equivalent treatment on others.

(informal) Used to indicate acceptance by the speaker of a proposal or challenge, especially a competitive one.

(idiomatic, vulgar) To ejaculate; to cum. / (idiomatic, vulgar or slang, figuratively) To expend one's resources or one's opportunity, especially prematurely; to blow one's chance.

While flying; in flight. / (figuratively) In motion. / (figuratively) Departing.

(colloquial, only with a negative) Even if one's (own) life depended on it; at all.

(Britain, humorous) Intentional misrendering of the proverb "the world is one's oyster".

Written on an invitation to request that the invited person reply only if they will not attend.