1726 (implied in
gambling), from a dialectal survival of M.E.
gammlen, variant of
gamenen "to play, jest, be merry," from O.E.
gamenian "to play," from
gamen (see
game). Or possibly
gamble is from a derivative of
gamel "to play games" (1594), itself likely a frequentative from
game. Originally regarded as a slang word. The intrusive
-b- may be from confusion with
gambol. Related:
Gambled;
gambling.