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Concise Oxford English Dictionary © 2008 Oxford University Press:
buck1

▶noun

• 1 the male of some animals, especially deer and antelopes.

  ■ S. African an antelope (of either sex).

• 2 a vertical jump performed by a horse, with the head lowered, back arched, and back legs thrown out behind.

• 3 archaic a fashionable and daring young man.

▶verb

• 1 (of a horse) perform a buck.

• 2 oppose or resist: buck the trend.

• 3 (buck someone up or buck up) informal make or become more cheerful.

▶adjective US military slang lowest of a particular rank: a buck private.

– phrases
buck up one's ideas become more serious, energetic, and hard-working.

– origin OE: partly from buc ‘male deer’, of Gmc origin; reinforced by bucca ‘male goat’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
buck2

▶noun informal

• 1 N. Amer. & Austral./NZ a dollar.

• 2 S. African a rand.

• 3 Indian a rupee.

– phrases
a fast buck easily and quickly earned money.

– origin C19: of unknown origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
buck3

▶noun an object placed as a reminder in front of a poker player whose turn it is to deal.

– phrases
the buck stops here informal the responsibility for something cannot be passed to someone else.
pass the buck informal shift responsibility to someone else.

– origin C19: of unknown origin.