Green’s Dictionary of Slang

1. to beat; to punch, to hit; as n. a blow.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1792		C. Dibdin ‘Dicky Ditto’ in Buck’s Delight 74: Adzooks, old crusty, / Why so rusty, / Stupid queer and mumpy? / Egad if you don’t mind your manners, / Somebody will lump you.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1859		Matsell Vocabulum.
1902		A.N. Lyons Hookey 134: ‘Look here,’ said Hookey, ‘if a girl was to come along an’ lump you in the mouth, what would you do?’ [...] ‘You’d lump ’er back again – that’s what you’d do.’.
1931		A. Bontemps God Sends Sun. 63: I ain’t gonna have it. No nigger is gonna lump yo’ eyes lak dat, long as I’s in town. [Ibid.] 81: Any woman dat messes wid me gotta take de lumps. I’d slap yo’ eyeteeth out.
1952		(con. 1920s) ‘Harry Grey’ Hoods (1953) 297: If they had thought [...] they could get away with lumping us up without a fight, they would have tried it.
1958		W. Talsman Gaudy Image (1966) 15: They’ll lump you up good.
1967		P. Thomas Down These Mean Streets (1970) 28: Hey, you sure look a little lumped up. What happened?
1985		N. Pileggi Wiseguy (2001) 113: Lump them up. Whack them out.
2019		N. Walker Cherry 249: I could see his face was lumped up pretty well and that was too bad for Manny.

2. (US) to murder.

1958

R. Prather Scrambled Yeggs 75: Joe got lumped Wednesday night sometime before eleven.

3. (US) to hit someone over the head with a lump of stone or a brick.

1960

H. Selby Jr ‘Tralala’ in Provincetown Rev. 3 74: If they looked easy one would hold him and the other(s) would lump him.