ˌone-armed ˈbandit noun [countable] a machine with a long handle, into which you put money in order to try to win more money
Synonym : slot machine, fruit machine British English [TahlilGaran] Dictionary of Contemporary English ▲
one armed bandit n.,
slang A slot machine, like those used in Las Vegas and other gambling places.
Joe was playing the one-armed bandit all day
■ and he lost everything he had. [TahlilGaran] English Idioms Dictionary ▲