bluff [1]
vb
1 to pretend to be confident about an uncertain issue or to have undisclosed resources, in order to influence or deter (someone)
n
2 deliberate deception intended to create the impression of a stronger position or greater resources than one actually has
3 ♦
call someone's bluff to challenge someone to give proof of his claims
(C19: originally US poker-playing term, from Dutch bluffen to boast)
♦
bluffer n