Definition of buck noun from the Oxford Advanced American Dictionary

     

    buck

     noun
    noun
    NAmE//bʌk//
     
     
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  1. 1 [countable] (informal) a dollar They cost ten bucks. We're talking big bucks (= a lot of money) here.
  2. 2[countable] a male deer, hare, or rabbit (also called abuck rabbit) compare doe, hart, stag
  3. 3 the buck [singular] used in some expressions to refer to the responsibility or blame for something It was my decision.The buck stops here (= no one else can be blamed). I was tempted to pass the buck (= make someone else responsible). From buck, an object that in a poker game is placed in front of the player whose turn it is to deal.
  4. Idioms
    bang for your buck(informal)
     
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    if you get more, better, etc. bang for your buck, you get better value for the money you spend or the effort you put in to something
    look/feel like a million dollars/bucks(informal)
     
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    to look/feel extremely good Wow, you look like a million dollars.
    make a fast/quick buck(informal)(often disapproving)
     
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    to earn money quickly and easily This is a long-term project. We are not out to make a quick buck.
See the Oxford Advanced Learner's Dictionary entry: buck