buck
n. US //ˈbək// UK //bˈʌk// buck
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1 male deer or other animal (n.) B2 Upper Intermediatea male deer. The word is also used for the male of some other animals, such as antelopes, rabbits, goats, and hares.
the male of certain mammals — chiefly deer, but also antelope, rabbit, hare, and goat.
ExampleA large buck stepped out of the trees.
ExampleDuring the rut, a dominant buck fights off rival males to defend a group of does.
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2 a dollar (n.) C1 Advanced Informalan informal word for a dollar, especially in American English. You might hear someone say something costs 'ten bucks'.
an informal term for a unit of currency, most frequently the United States dollar; also common in Australian and Canadian English.
ExampleThis coffee costs five bucks.
ExampleThe entrepreneur's first venture was funded with a thousand bucks borrowed from family.