Definition from Wiktionary, the free dictionary
beater-upper (plural beater-uppers)
- One who beats people up.
1941 August 11, “Barrymore Beaten Up While Working For His Creditors”, in St. Petersburg Times:
- Yesterday he was doing just that by submitting to a thorough beating up at the hands of Miss Lupe Velez, who's probably the best beater-upper of either sex in Hollywood.
1965, Hearings [Agriculture dept.]:
- These are the muggers and beater-uppers, and car thieves and burglars and rapists, assaulters, and so on.
1985 May 27, “A pug and a gentleman”, in The Sydney Morning Herald:
- […] and, in the best sporting tradition, the Gordon player gratefully helped his beater-upper back to his feet.