What is the meaning of bluff?

noun

• A high steep bank (usually formed by river erosion. )
• Pretense that your position is stronger than it really is.
  • usage: "his bluff succeeded in getting him accepted"
• The act of bluffing in poker; deception by a false show of confidence in the strength of your cards.
  • synonyms: four flush

verb

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

adjective

• Very steep; having a prominent and almost vertical front.
  • usage: "a bluff headland"; "where the bold chalk cliffs of England rise"; "a sheer descent of rock"
  • synonyms: bold, sheer
• Bluntly direct and outspoken but good-natured.
  • usage: "a bluff but pleasant manner"; "a bluff and rugged natural leader"