the.com/bluff

A poker face is just confidence wearing a costume nobody asked to remove.

means To bluff is to deceive someone by projecting confidence or making a bold claim you can't actually back up — or, as a noun, a steep cliff or headland with a broad, flat face.

from Two meanings braided into one word. The 'steep cliff' sense came from Dutch or Low German nautical talk — bluffs were the blunt, broad bows of ships and, by extension, anything broad-faced and steep, like a coastal headland. The 'deceive' sense arrived later through American card tables: it's likely from Dutch bluffen or verbluffen, 'to brag, to bluster, to baffle.' Both share a flavor of broad, flat, in-your-face boldness — which fits a game built on staring someone down.

steep cliff
A bluff is also a high, broad headland or riverbank
call it
Naming the lie ends its power instantly
war tactic
Patton built fake armies to bluff Hitler's generals
animal kingdom
Pufferfish bluff predators by inflating into spiky balloons
word origin
From Dutch sailors meaning broad and flat
for instance

mount bluff arkansas — 883-foot prominent hill in lawrence county, arkansas, the highest point in the state's ozark region

bluff city tennessee — city in lauderdale county, tennessee, founded 1860 along the mississippi river

council bluffs iowa — city of 62,000+ in pottawattamie county, iowa, founded 1851 as major missouri river settlement

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