noun

• (countable or uncountable) An act of bluffing; a false expression of the strength of one’s position in order to intimidate or deceive; braggadocio.
  "That is only bluff, or That is only a bluff."
• (poker, countable or uncountable) An attempt to represent oneself as holding a stronger hand than one actually does.
  "John’s bet was a bluff: he bet without even so much as a pair."
• (US, dated, uncountable) The card game poker.
  "BLUFF OR POKER [title of a chapter]"
• (countable) One who bluffs; a bluffer.

verb

• (poker) To make a bluff; to give the impression that one’s hand is stronger than it is.
  "John bluffed by betting without even a pair."
• (by analogy) To frighten, deter, or deceive with a false show of strength or confidence; to give a false impression of strength or temerity in order to intimidate or gain some advantage.
  "The government claims it will call an election if this bill does not pass. Is it truly ready to do so, or is it bluffing?"
• (Manglish, Singlish) To give false information intentionally, to lie (to someone), to deceive; to put on an act.
  "Vinod, you want to bluff the doctor, your mother, father, uncle, auntie, CMPB all that I don't care. But you cannot bluff me."

noun

• (Canadian Prairies) A small wood or stand of trees, typically poplar or willow.