Merriam-Webster's Collegiate® Dictionary, 11th Edition
GAMMON
I. noun see: gambit
Date: 15th century
ham 2,
2. chiefly British a side of bacon, the lower end of a side of bacon,
II. noun
Etymology: perhaps alteration of Middle English gamen game
Date: circa 1734
backgammon , the winning of a backgammon game before the loser removes any men from the board,
III. transitive verb
Date: 1735
to beat by scoring a gammon,
IV. verb
Date: 1789
intransitive verb to talk gammon, pretend , feign , transitive verb deceive , fool ,
V. noun
Etymology: perhaps from argot to give (someone) gammon to distract a victim during a robbery
Date: 1805
talk intended to deceive