adjective
Definition: Referring to the lowest rank in a specific military category, often used to describe a junior soldier.
Example: He started his career as a buck private in the army.
intransitive verb
Definition: To leap or jump suddenly, often with a strong upward motion, or to resist stubbornly.
Example: The horse bucked when it saw the snake on the ground.
noun
Definition: A young male animal, especially a deer or rabbit, or a term used to describe a lively young man.
Example: The buck jumped gracefully over the fence.