What does "buck" mean?

In addition to the idioms beginning with buck, also see big bucks; fast buck; more bang for the buck; pass the buck.

See buck in WNW Idioms

buck for

☆
Slang to work eagerly or too eagerly for (a promotion, etc.)

buck up

☆
Informal to cheer up

pass the buck

Informal to evade blame or responsibility by trying to pass it to someone else

See buck in American Heritage Dictionary 4 Idioms

the buck stops here

Informal
The ultimate responsibility rests here.

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