Etymology
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brash (adj.)

"impetuous, rash, hasty in temper," 1824, of obscure origin, perhaps originally American English; perhaps akin to 16c. Scottish brash "attack, assault," or French breche "fragments," especially of ice, which is from a Germanic source (compare Old High German brehha "breach," from brehhan "to break," from PIE root *bhreg- "to break"). Or perhaps akin to German brechen "to vomit." Not considered to be connected with rash (adj.) though they mean the same. Related: Rashly; rashness.

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Definitions of brash

brash (adj.)
offensively bold;
a brash newcomer disputed the age-old rules for admission to the club
Synonyms: cheeky / nervy
From wordnet.princeton.edu