n. a lot of money. (See also megabucks.) : She gets paid big bucks to worry about stuff like that.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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A great deal of money, as in A swimming poolthat means you're spending big bucks. Buck has been slang for "dollar" since the mid-1800s. [Slang; second half of 1900s]