Green’s Dictionary of Slang

copper adj.

SE in slang uses

In compounds

copper captain (n.) [his ‘brass’ or cheek in posing in this way]

a fraudulent, ‘self-promoted’ officer.

[UK]G.A. Sala Twice Round the Clock 166: Where these ruffiani, these copper captains and cozening buz-gloaks, are to be found [...] must remain a secret.
[UK]Daily News 26 Aug. in Ware (1909) 92/1: The company contains many copper captains, brazen adventurers, and women whose character is advertised in their countenances.
[UK]G.A. Sala Things I Have Seen II 60: Hoary-headed old roués, copper captains, ruined speculators, chronically distressed poets, [etc.].
copper nob (n.) (also copper-knob, copper-nut) [nob n.1 (1)]

a red-headed person.

[UK]D.W. Barrett Life and Work among Navvies 49: A man with red hair would be termed a ‘Copper-knob’.
[UK]Leicester Chron. 12 July 10/4: ‘Look here, old copper nut,’ he said to the old pauper.
[UK]Nottingham Eve. Post 20 Feb. 6/2: Copper Nob! Ginger Hair A beautiful Gift from the Gods.
[UK]Rover 18 Feb. 18: The copper-knob is many times a fool, but he has the heart of a lion.
[UK]I. & P. Opie Lore and Lang. of Schoolchildren (1977) 191: ‘Ginger, you’re barmy, getcher ’air cut’ has been a greeting to copper-nobs ever since it was a catch phrase in the Harry Champion song.
[Aus]P. White Solid Mandala (1976) 32: Arthur’s the fair one, the copper-knob.
[UK]Guardian G2 22 Mar. 16: The octegenarian maths master [...] used to call me copper-nob.
copper-plated (adj.) (also copper-plate) [var. on SE gold-plated]

(US) absolute, certain, definite.

[US]E. Nye Bill Nye’s Remarks 362: He called me a copperplate ass [HDAS].
[US]E. Hemingway letter 6 Dec. in Baker Sel. Letters (1981) 137: He has been hooked and married by the most absolute copper plated bitch in the world.
coppertail (n.) (also coppertop) [the inferiority of copper compared with silver]

(Aus.) an unimportant person, a person of little social standing; thus a democrat rather than an aristocrat; thus copper-tailed adj.

[Aus]Bulletin (Sydney) 18 Jul. 18/2: There was war to the knife at Dubbo last week between the local ‘copper tops’ and the fastidious ‘silver tails,’ and Carcoar has the same story to tell.
[UK]A.J. Vogan Black Police 116: Members of those upper circles who belong to the genus termed in Australia parlance ‘silver-tailed,’ in distinction to the ‘copper-tailed’ democratic classes.
[Aus]Bulletin (Sydney) 28 Sept. 15/1: [S]ocial gatherings in the bush [...] are most drearily proper. ‘Silvertails’ congregate at one end of the room, ‘Coppertails’ at the other, and the line of demarcation is rarely crossed.
[Aus]N. Pulliam I Travelled a Lonely Land (1957) 232/1: coppertail (prole) – one of the hoi polloi.
coppertop (n.)

1. a red-headed person; thus copper-topped adj.

[Aus]Bulletin (Sydney) 17 July 6/3: At a recent football match a larrikin was heard to observe of one of our best players who boasts of auburn hair, ‘Copper Top is down again; he’s a duffer.’ ‘Is he, sneered a comrade, ‘that’s all you know; why ginger’s the champion kicker of the crowd’.
[US]N.Y. Tribune 23 June 30: ‘Just two industries in this blankety country,’ growled Coppertop, ’grand larceny and petty larceny!’.
Dakota County Herald (NE) 4 Apr. 3/1: It would be worth while for me to broach to this copper-topped stranger the scheme that had kept me awake nights.
[Aus]C.J. Dennis Songs of a Sentimental Bloke gloss. [Internet] Copper-top – Red head.
[Aus]C.J. Dennis ‘War’ in Moods of Ginger Mick 26: ’E chews it over solid fer a bit, / Workin’ ’is copper-top a double shift.
[UK]Marvel 3 Mar. 6: Apologise to whom, you copper-topped brat? What are you ranting about?
[Aus]Cusack & James Come in Spinner (1960) 5: Gosh, look at that coppertop!
[Aus]T. Davies More Aus. Nicknames 40: Coppertop Another redhead.

2. see coppertail