Definition of "endorse"

To express support or approval, especially officially or publicly.  examples

To write one's signature on the back of a cheque, or other negotiable instrument, when transferring it to a third party, or cashing it.  examples

To give an endorsement.  examples

(medicine) To report (a symptom); to describe.  examples

(heraldry) A diminutive of the pale, usually appearing in pairs on either side of a pale.  examples