Webster
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Webster’s Revised Unabridged Dictionary · 1913

Bluff

Bluff (blŭf), a. [Cf. OD. blaf flat, broad, blaffaert one with a broad face, also, a boaster; or G. verblüffen to confuse, LG. bluffen to frighten; to unknown origin.] 1. Having a broad, flattened front; as, the bluff bows of a ship. "Bluff visages." Irving.

2. Rising steeply with a flat or rounded front. "A bluff or bold shore." Falconer.

Its banks, if not really steep, had a bluff and precipitous aspect. Judd.

3. Surly; churlish; gruff; rough.

4. Abrupt; roughly frank; unceremonious; blunt; brusque; as, a bluff answer; a bluff manner of talking; a bluff sea captain. "Bluff King Hal." Sir W. Scott.

There is indeed a bluff pertinacity which is a proper defense in a moment of surprise. I. Taylor.

Bluff, n. 1. A high, steep bank, as by a river or the sea, or beside a ravine or plain; a cliff with a broad face.

Beach, bluff, and wave, adieu. Whittier.

2. An act of bluffing; an expression of self-confidence for the purpose of intimidation; braggadocio; as, that is only bluff, or a bluff.

3. A game at cards; poker. [U.S.] Bartlett.

Bluff, v. t. [imp. & p. p. Bluffed; p. pr. & vb. n. Bluffing.] 1. (Poker) To deter (an opponent) from taking the risk of betting on his hand of cards, as the bluffer does by betting heavily on his own hand although it may be of less value. [U. S.]

2. To frighten or deter from accomplishing a purpose by making a show of confidence in one's strength or resources; as, he bluffed me off. [Colloq.]

Bluff, v. i. To act as in the game of bluff.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.