Definition of "Bluff" :
noun: the act of bluffing in poker; deception by a false show of confidence in the strength of your cards
noun: pretense that your position is stronger than it really is
"His bluff succeeded in getting him accepted."
noun: a high steep bank (usually formed by river erosion)
verb: frighten someone by pretending to be stronger than one really is
verb: deceive an opponent by a bold bet on an inferior hand with the result that the opponent withdraws a winning hand
adjective: bluntly direct and outspoken but good-natured
"A bluff but pleasant manner."
adjective: very steep; having a prominent and almost vertical front
"A bluff headland."