nervo and knox, n. — Green’s Dictionary of Slang

nervo and knox n.

[rhy. sl.; ult. Jimmy Nervo (1890–1975) and Teddy Knox (1896–1974), music-hall comedians and members of the Crazy Gang (1935–62)]

1. socks.

1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1984		Partridge DSUE (8th edn) 786: since ca. 1940.

2. venereal disease, esp. syphilis [= pox n.¹].

1977

D. Powis Signs of Crime 194: Nervo (and Knox) Syphilis (pox): ‘A dose of the old Nervo.’ (Names of an old music hall duo of comedians.).

3. television [= box n.¹ (4)].

1969		S.T. Kendall Up the Frog 21: ’E’d got a Nervo & Knox.
1971		J. Jones Rhy. Cockney Sl.
1984		Partridge DSUE (8th edn) 786: later C.20.