Merriam-Webster Collegiate Dictionary - brat

 noun  Etymology: perhaps from English dialect ~ coarse garment  Date: circa 1505  1.  a. child; specifically an ill-mannered annoying child a spoiled ~  b. an ill-mannered immature person  2. the child of a career military person army ~s; also the child of a person whose career is in a specified and typically unusual field Hollywood ~s  • ~tiness noun  • ~tish adjective  • ~ty adjective