endorse

Concise Oxford English Dictionary © 2008 Oxford University Press:
endorse /ɪnˈdɔːs, ɛn-/ (US & Law also indorse)

▶verb

• 1 declare one's public approval of.

• 2 sign (a cheque or bill of exchange) on the back to specify another as the payee or to accept responsibility for paying it.

  ■ write (a comment) on a document.

• 3 Brit. enter an endorsement on (a driving licence).

– derivatives
endorsable adjective,
endorsee noun,
endorser noun.

– origin C15: from med. L. indorsare, from L. in- ‘in, on’ + dorsum ‘back’.