to approve, support, or sustain

to endorse a political candidate.

to designate oneself as payee of (a check) by signing, usually on the reverse side of the instrument.

to sign one's name on (a commercial document or other instrument).

to make over (a stated amount) to another as payee by one's endorsement.

to write (something) on the back of a document, paper, etc.

to endorse instructions; to endorse one's signature.

to acknowledge (payment) by placing one's signature on a bill, draft, etc.

Heraldry . a narrow pale, about one quarter the usual width and usually repeated several times.