Longman Dictionary of Contemporary English homepage

Sense: 1-2
Date: 1800-1900
Origin: BLUFF1
Sense: 3
Date: 1600-1700
Origin: BLUFF3

bluff

2 noun
     
Related topics: Nature, Geology, Geography
bluff2
1 [uncountable and countable] an attempt to deceive someone by making them think you will do something when you do not intend to do it:
The threat was only a bluff.
Whatever you say, you must do it. This isn't a game of bluff.
 ➔ double bluff
2

call somebody's bluff

to tell someone to do what they have threatened because you do not believe that they will really do it
3 [countable]DN a very steep cliff or slope
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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