Lord Mansfield’s teeth, n. — Green’s Dictionary of Slang

Lord Mansfield’s teeth n.

[Lord Mansfield (1733–1821), Lord Chief Justice of the Court of Common Pleas]

the row of spikes embedded into the top of the wall of the King’s Bench prison.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Lord Mansfield’s Teeth. the Cheveux de Frise round the top of the Walls of the King’s Bench Prison.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn) n.p.: