A child, so called in contempt.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (noun) (n.) (noun)
A child; used contemptuously.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
A name given in reproach to a child.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (noun) (n.) (noun)
A contemptuous name for a child.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)
A contemptuous term for a child.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (noun) (n.) (noun)

Usage examples:

I air tired, Brat and there be nettin' to- night.
- Tess of the Storm Country by Grace Miller White
She was a brat with the temper of a little fiend, and no ear- absolutely none- for music; played like an elephant.
- The Madigans by Miriam Michelson
Am I a dog, to fetch drink for this beggar brat
- Nautilus by Laura E. Richards