Bluff

Noun:
1. A high steep bank (usually formed by river erosion)
2. Pretense that your position is stronger than it really is

Usage: 
"his bluff succeeded in getting him accepted"

3. The act of bluffing in poker; deception by a false show of confidence in the strength of your cards

Verb:
1. Deceive an opponent by a bold bet on an inferior hand with the result that the opponent withdraws a winning hand
2. Frighten someone by pretending to be stronger than one really is

Adjective:
1. Very steep; having a prominent and almost vertical front

Usage:
"a bluff headland"

2. Bluntly direct and outspoken but good-natured

Usage:
"a bluff but pleasant manner"; "a bluff and rugged natural leader"

Synonyms

1. Bluff out
2. Bold
3. Four Flush
4. Sheer