Seek gain or advancement by fawning or flattery, as in Edith was famous for currying favor with her teachers. This expression originally came from the Old French estriller fauvel, "curry the fallow horse," a beast that in a 14th-century allegory stood for duplicity and cunning. It came into English about
1400 as
curry favel--that is, curry (groom with a currycomb) the animal--and in the 1500s became the present term.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.