verb
I bluffed him into believing that I held four aces
She became frightened, unaware that I was only bluffing
noun
Roger's ranting is all bluff - he's really very timid
adjective
Fred's bluff manner puts many people off
That comment is typical of his bluff honesty
noun
As you sail down the lower Hudson river, the tall bluffs form a natural wall along the western bank
US