What is Endorse ?
Endorse is (verb) 1. to officially mark or sign the back of a document to endorse a cheque to sign a cheque on the back to show that you accept it The cashier asked him to endorse the cheque before depositing it. his driving licence was endorsed his licence was marked to show that he had committed a traffic offence 2. to show approval of I heartily endorse what has just been said. They asked us to endorse Mrs Martin as the local candidate.
source: Easier English, Student Dictionary Upper Intermediate Level