"bluffs" in the noun sense
1. bluff
a high steep bank (usually formed by river erosion)
2. bluff
pretense that your position is stronger than it really is
"his bluff succeeded in getting him accepted"
3. bluff, four flush
the act of bluffing in poker deception by a false show of confidence in the strength of your cards
"bluffs" in the verb sense
1. bluff, bluff out
deceive an opponent by a bold bet on an inferior hand with the result that the opponent withdraws a winning hand
2. bluff
frighten someone by pretending to be stronger than one really is
Source: WordNet® (An amazing lexical database of English)
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