brat

Etymology 1

Early Modern English (ca. 1500) slang term meaning "beggar's child". Possibly from Scots bratchet (“bitch, hound”). Or, possibly originally a dialectal word, from northern and western England and the Midlands, for a "makeshift or ragged garment," from Old English bratt (“cloak”), which is from a Celtic source (Old Irish brat (“cloak, cloth”)).

noun

1. (slang) A human child.
   1. (derogatory) A child who is regarded as mischievous, unruly, spoiled, or selfish.
      Get that little brat away from me!
      He would never speak a word, - only eat and cry, and she hadn't the heart to strike it or illtreat the youngster either; but somebody taught her a charm to make him speak, and then she found out what kind of a brat he really was. 1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 297
   2. (slang) A child (at any age) of an active member of the military or the diplomatic service.
      an army brat
2. A turbot or flatfish.
   For the crabby awd dealers in ling, cod, and brats / And the vurgins that tempt us wi' nice maiden skyet... 1843, Thomas Wilson, The Movement
3. (historical) A rough cloak or ragged garment.
   Whicħ þat þey myght / wrape hem in at nyght / And a brat / to walk in / by day-light 1386, Geoffrey Chaucer, “Line 881”, in The Canon's Yeoman's Tale
   The chief's daughter wears a brat and léine girdled with a criss. 1961, Audrey I. Barfoot, Everyday costume in Britain: from the earliest times to 1900, page 80
   The prevailing style of dress in the early medieval period comprised a léine (tunic) worn under a brat (cloak). 2005, Seán Duffy, Medieval Ireland: An Encyclopedia, page 156
   Women wore loose, flowing, ankle-length robes modelled on 11th-century European fashion (derived from what O'Neill called the léine) and, perhaps, a brat over these. 2006, Celtic Culture: A-Celti, page 1272
4. (obsolete, UK, Scotland, dialect) A coarse kind of apron for keeping the clothes clean; a bib.
   [She] had still on the rough worsted apron of nappy homespun wool, called a "brat". 1882, John Strathesk, “pp. 135”, in Blinkbonny
5. (obsolete) The young of an animal.
   They are your Will-Worship-men, your Prelates Brats: Take the whole Litter of’um, and you’ll finde never a barrel better Herring. 1680, Roger L'Estrange, Citt and Bumpkin

verb

1. (BDSM, intransitive) To act in a bratty manner (as the submissive).
   Ruthie was Ed's own submissive, a short, pretty, feisty ash-blonde New York City native who combined her submission to Ed with a good deal of mischievous bratting and a lot of sharp, intelligent conversation […] 1900, Ardie Stallard, Switch: A Tale of Spanking, BDSM & Romance
   Rather, Ana moves between playful bratting and a type of “conquer me” wantedness that good Dominants would respond to with increased control and correction. 2020, Jessica M. Kratzer, Communication in Kink, page 43

Etymology 2

Shortened from bratwurst, from German Bratwurst.

noun

1. (informal) Bratwurst.
   There are many people loitering, eating ice cream, talking, eating brats. 2020, Brandon Taylor, Real Life, Daunt Books Originals, page 267

Etymology 3

noun

1. (mining) A thin bed of coal mixed with pyrites or carbonate of lime.

Etymology 4

noun

1. (military) Acronym of Born, Raised, And Transferred.