Green’s Dictionary of Slang

(UK Und.) a blow.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Click, a blow, (cant) a click in the muns, a blow or knock in the face.
1811		Lex. Balatronicum.
1819		‘One of the Fancy’ Tom Crib’s Memorial to Congress 18: What with clouts on the nob, / Home hits in the bread-basket, clicks in the gob. [Ibid.] 30: Old CORCORAN’S click, that laid cutomers flat.
1821		‘An Amateur’ Real Life in London I 110: Neat milling we had, what with clouts on the nob, / Home hits in the bread-basket, clicks in the gob, / And plumps in the daylights, a prettier treat / Between two Johnny Raws ’tis not easy to meet.
1833		‘Rum Ould Mog’ in Corinthian in Spedding & Watt (eds) Bawdy Songbooks (2011) IV 33: Vith his click in his fib, and his ranting out, / In his ‘wery prime taters’ cry.
1834		‘Jack Downing’ Andrew Jackson 26: Every click tell’d; the gineral giv’d Swan sich a stoter on the nob that he reel’d back.
1835		G. Kent Modern Flash Dict.
1848		Flash Dict. in Sinks of London Laid Open.
1859, 1860		Hotten Dict. of Modern Sl. etc.
1871		Daily Tel. 8 Apr. n.p.: C. and W. Wrestling Society. The various competitors struggled hard and put on all they know in ‘hipes,’ ‘hanks,’ ‘clicks,’ ‘strokes,’ and ‘buttockings’ [F&H].
1881		Trumble Sl. Dict. (1890).