Green’s Dictionary of Slang

indorse with a cudgel v.

[SE indorse, stamping the flesh of one’s victim]

to thrash, to beat with a stick.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.