Definition of bluff noun from the Oxford Advanced American Dictionary

     

    bluff

     noun
    noun
    NAmE//blʌf//
     
     
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  1. 1[uncountable, countable] an attempt to trick someone by making them believe that you will do something when you really have no intention of doing it, or that you know something when you do not, in fact, know it It was just a game of bluff. He said he would resign if he didn't get more money, but it was only a bluff. see also double bluff
  2. 2[countable] a steep cliff or slope, especially by the ocean or a river see also blind man's bluff
  3. Idioms
    call somebody's bluff
     
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    to tell someone to do what they are threatening to do, because you believe that they will not be cruel or brave enough to do it
See the Oxford Advanced Learner's Dictionary entry: bluff