The Oxford Thesaurus An A-Z Dictionary of Synonyms - endorse v.

1) indorse, approve, sanction, authorize, advocate, support, back, subscribe to, sustain, confirm, countenance, put one's stamp or seal (of approval) on, set one's seal (of approval) to, give (something) one's imprimatur, Colloq OK, okay: The council endorsed our application for planning permission. 2) indorse, countersign: Endorse the cheque to cash it.