1. Cloy To pierce; gore.; Cloy In farriery, to prick (a horse) in shoeing.; Cloy To stop up; obstruct; clog.; Cloy To spike; drive a spike into the vent of: as, to Cloy a gun.; Cloy To satiate; gratify to repletion or so as to cause loathing; surfeit; sate.; Cloy Synonyms Sate, etc