Webster's English Dictionary

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bluff

1. bluff \'bl*f\ aj [obs. D blaf flat; akin to MLG blaff smooth] 1a: having 
   a broad flattened front  1b: rising steeply with a broad front either flat 
   or rounded  2: good-naturedly frank and outspokenMGRUFF mean abrupt and 
   unceremonious in speech and manner. BLUFF connotes good-natured 
   outspokenness and unconventionality; BLUNT suggests directness of 
   expression in disregard of others' feelings; BRUSQUE applies to a sharpness 
   or ungraciousness that may be intentional or merely incidental to loss of 
   emotional control; CURT stresses shortness and may or may not imply 
   discourtesy; CRUSTY suggests a harsh or surly manner sometimes concealing 
   an inner kindliness; GRUFF suggests a hoarse or husky speech which may 
   imply bad temper but more often implies embarrassment or shyness - bluff.ly 
   av SYN syn BLUFF, BLUNT, BRUSQUE, CURT, CRUSTY, ( 
2. bluff n : a high steep bank : CLIFF 
3. bluff vb [prob. fr. D bluffen to boast, play a kind of card game] 1: to 
   deceive (an opponent) in cards by a bold bet on an inferior hand wit h the 
   result that the opponent withdraws a winning hand 2a: to deter or frighten 
   by pretense or a mere show of strength  2b: DECEIVE  2c: FEIGN  : to bluff 
   or try to bluff someone  - bluff.er n
4. bluff n 1a: an act or instance of bluffing  1b: the practice of bluffing 
    2: one who bluffs