Green’s Dictionary of Slang

1. to kill, to murder.

1838		‘James O’Bryan, The Informer’ in Memoirs of Joseph Holt [title] And de lad dat so many did out, / Must at last be tuck’d up to de pulley.
1956		H. Ellison ‘Made in Heaven’ in Deadly Streets (1983) 187: They’re gonn a be really looking for the characters did him out.

2. (US) to knock out.

1937

C. Pifer ‘Executioner’ in All-America Sports Mag. Jan. 🌐 If he does out your man in the first, we get a crack at Trombone Johnson.

3. (US prison) to behave; usu. in phr. don’t do out like that, don’t behave in a way likely to debase oneself in the eyes of one’s fellow convicts.

1981		Maledicta V:1+2 (Summer + Winter) 266: Convicts told don’t do out like that are being asked not to react in a way that will draw the scorn of fellow inmates. This phrase arose perhaps from the custom of taking a convict, who died in prison without any family, out of the cellblock without any fanfare to a prison grave.
2008		posting at www.datingfast.com 🌐 she knows i would never do out like that.