See Indorse, Indorsement.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (verb) (v.) (verb)
To authorize; to write on the back of; said of a check or note. Also, indorse.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (verb) (v. t.) (verb transitive)
See Indorse.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (verb) (v.) (verb)
Same as Indorse.
- Newage Dictionary DB (verb) (v. t.) (verb transitive)

Usage examples:

It is not charity you are asked to perform, but such consideration for customers as a really intelligent sense of self- interest will endorse
- Morals of Economic Internationalism by John A. Hobson
I heartily endorse his opinion of them!
- The Charm of Ireland by Burton Egbert Stevenson
What do you say, if we endorse this over to the American Red Cross?
- Whispering Wires by Henry Leverage