Princeton's WordNet

1. bluff(noun)

   a high steep bank (usually formed by river erosion)

2. bluff(noun)

   pretense that your position is stronger than it really is

   "his bluff succeeded in getting him accepted"

3. bluff, four flush(adj)

   the act of bluffing in poker; deception by a false show of confidence in the strength of your cards

4. bluff, bold, sheer(adj)

   very steep; having a prominent and almost vertical front

   "a bluff headland"; "where the bold chalk cliffs of England rise"; "a sheer descent of rock"

5. bluff(verb)

   bluntly direct and outspoken but good-natured

   "a bluff but pleasant manner"; "a bluff and rugged natural leader"

6. bluff, bluff out(verb)

   deceive an opponent by a bold bet on an inferior hand with the result that the opponent withdraws a winning hand

7. bluff(verb)

   frighten someone by pretending to be stronger than one really is

Kernerman English Learner's Dictionary

1. bluff(verb)ʌf

   to try to deceive

   She'd been bluffing throughout the game.

2. bluff(noun)ʌf

   an attempt to deceive

   I could tell it was a bluff.

3. bluffʌf

   to challenge sb when you do not believe what they say

   I called his bluff and asked him to show me the money.

Webster Dictionary

1. Bluff(adj)

   having a broad, flattened front; as, the bluff bows of a ship

2. Bluff(adj)

   rising steeply with a flat or rounded front

3. Bluff(adj)

   surly; churlish; gruff; rough

4. Bluff(adj)

   abrupt; roughly frank; unceremonious; blunt; brusque; as, a bluff answer; a bluff manner of talking; a bluff sea captain

5. Bluff(noun)

   a high, steep bank, as by a river or the sea, or beside a ravine or plain; a cliff with a broad face

6. Bluff(noun)

   an act of bluffing; an expression of self-confidence for the purpose of intimidation; braggadocio; as, that is only bluff, or a bluff

7. Bluff(noun)

   a game at cards; poker

8. Bluff(verb)

   to deter (an opponent) from taking the risk of betting on his hand of cards, as the bluffer does by betting heavily on his own hand although it may be of less value

9. Bluff(verb)

   to frighten or deter from accomplishing a purpose by making a show of confidence in one's strength or resources; as, he bluffed me off

10. Bluff(verb)

    to act as in the game of bluff

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