Newman’s, adj. — Green’s Dictionary of Slang

Newman’s adj.

[SE New(gate) + -mans sfx]

pertaining to Newgate prison.

Newman’s hotel (also Mr Newman’s courtyard, Newman’s tea-gardens) [SE courtyard/hotel n. (2)/pun on SE tea-gardens]

Newgate prison.

1811		Lex. Balatronicum n.p.: Newman’s Tea Gardens. Newgate. [Ibid.] Newman’s Hotel. Newgate.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue [as cit. 1811].
1828		Lytton Pelham III 298: A square crib, indeed! aye, square as Mr. Newman’s courtyard—ding boys on three sides, and the crap on the fourth!

Newman’s lift (n.)

the gallows, erected outside Newgate prison.

1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.