"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."
from Online Etymology Dictionary
im sorry if sometimes we brat at you
It is "brat" in Latin; "брат" in Cyrillic.
Brat
Irish
from pooland
brat
The word "brat" has a short vowel sound.
wild child
brat
Brat.
Brat. (Br-aw-t)
Middle English meaning coarse garment.