To make a bluff; to give the impression that one's hand is stronger than it is.
To frighten or deter with a false show of strength or confidence; to give a false impression of strength or temerity in order to intimidate and gain some advantage.
Probably from Dutch bluffen ("to brag"), from Middle Dutch bluffen ("to make something swell; to bluff"); or from the Dutch noun bluf. Related to German verblüffen.
Related to Middle Low German blaff.
Possibly onomatopoeic, perhaps related to blow and puff.
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