bluff (Noun) — A high steep bank (usually formed by river erosion).
bluff (Noun) — Pretence that your position is stronger than it really is. ex. "his bluff succeeded in getting him accepted"
bluff (Noun) — The act of bluffing in poker; deception by a false show of confidence in the strength of your cards.
bluff (Verb) — (card game) deceive an opponent by a bold bet on an inferior hand with the result that the opponent withdraws a winning hand.
bluff (Verb) — Frighten someone by pretending to be stronger than one really is.
bluff (Adjective) — Very steep; having a prominent and almost vertical front. ex. "a bluff headland"
bluff (Adjective) — Bluntly direct and outspoken but good-natured. ex. "a bluff but pleasant manner" ex. "a bluff and rugged natural leader"