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."