a child, especially an annoying, spoiled, or impolite child (usually used in contempt or irritation).

1495–1505; perhaps transferred use of brat rag, Old English bratt cloak < Celtic; compare Irish brat mantle, cloak

brattish, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
brat1 (bræt)
a child, esp one who is ill-mannered or unruly: used contemptuously or playfully
[C16: perhaps special use of earlier brat rag, from Old English bratt cloak, of Celtic origin; related to Old Irish bratt cloth, brat²]

brat2 (bræt)
dialect (Northern English) an apron or overall
[from Old English brat cloak; related to Old Irish bratt cloth used to cover the body]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1500, slang, "beggar's child," originally northern, Midlands and western England dialect word for "makeshift or ragged garment;" probably the same word as O.E. bratt "cloak," which is from a Celtic source (cf. O.Ir. bratt "cloak, cloth"). The modern meaning is perhaps from notion of "child's apron."
Bratty is first recorded 1961. Hollywood Brat Pack (modeled on 1950s Rat Pack) is from 1985.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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