| 1. | the male of the deer, antelope, rabbit, hare, sheep, or goat. |
| 2. | the male of certain other animals, as the shad. |
| 3. | an impetuous, dashing, or spirited man or youth. |
| 4. | Often Disparaging. a male American Indian or black. |
| 5. | buckskin. |
| 6. | bucks, casual oxford shoes made of buckskin, often in white or a neutral color. |
| 7. | Military. of the lowest of several ranks involving the same principal designation, hence subject to promotion within the rank: buck private; buck sergeant. |

| 1. | (of a saddle or pack animal) to leap with arched back and come down with head low and forelegs stiff, in order to dislodge a rider or pack. |
| 2. | Informal. to resist or oppose obstinately; object strongly: The mayor bucked at the school board's suggestion. |
| 3. | (of a vehicle, motor, or the like) to operate unevenly; move by jerks and bounces. |
| 4. | to throw or attempt to throw (a rider or pack) by bucking. |
| 5. | to force a way through or proceed against (an obstacle): The plane bucked a strong headwind. |
| 6. | to strike with the head; butt. |
| 7. | to resist or oppose obstinately; object strongly to. |
| 8. | Football. (of a ball-carrier) to charge into (the opponent's line). |
| 9. | to gamble, play, or take a risk against: He was bucking the odds when he bought that failing business. |
| 10. | to press a reinforcing device against (the force of a rivet) in order to absorb vibration and increase expansion. |
| 11. | an act of bucking. |
| 12. | buck for, to strive for a promotion or some other advantage: to buck for a raise. |
| 13. | buck up, to make or become more cheerful, vigorous, etc.: She knew that with a change of scene she would soon buck up. |
| 1. | a sawhorse. |
| 2. | Gymnastics. a cylindrical, leather-covered block mounted in a horizontal position on a single vertical post set in a steel frame, for use chiefly in vaulting. |
| 3. | any of various heavy frames, racks, or jigs used to support materials or partially assembled items during manufacture, as in airplane assembly plants. |
| 4. | Also called door buck. a doorframe of wood or metal set in a partition, esp. one of light masonry, to support door hinges, hardware, finish work, etc. |
| 5. | to split or saw (logs, felled trees, etc.). |
| 6. | buck in, Surveying, Optical Tooling. to set up an instrument in line with two marks. |
| 1. | Poker. any object in the pot that reminds the winner of some privilege or obligation when his or her turn to deal next comes. |
| 2. | to pass (something) along to another, esp. as a means of avoiding responsibility or blame: He bucked the letter on to the assistant vice president to answer. |
| 3. | pass the buck, to shift responsibility or blame to another person: Never one to admit error, he passed the buck to his subordinates. |

| a dollar. |

buck
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"The 'buck' is any inanimate object, usually knife or pencil, which is thrown into a jack pot and temporarily taken by the winner of the pot. Whenever the deal reaches the holder of the 'buck', a new jack pot must be made." [J.W. Keller, "Draw Poker," 1887]The fig, sense of "shift responsibility" is first recorded 1912.
Buck
1. Trader's slang for a million dollars. 2. Informal reference to one dollar.
Investopedia Commentary
This is a perfect example of how Wall Street jargon differs from everyday usage.
See also: Teenie
buck
In addition to the idioms beginning with buck, also see big bucks; fast buck; more bang for the buck; pass the buck.