blazer, n. — Green’s Dictionary of Slang

blazer n.

[SE blazer, anything that blazes or shines]

(US)

1. someone or something exceptional of their type.

1833		Satirist (London) 14 Apr. 538/3: ‘I had a conundrum, Bobby; a blazer, by Jove!’.
1845		C.M. Kirkland Western Clearings (1846) 127: T’other gal is likely enough, but the mother’s a blazer! [DA].
1892		H. Lawson ‘The Captain of the Push’ in Roderick (1967–9) I 188: Before the Bleeders let yer come and join the push, / You must prove that you’re a blazer—you must prove that you have grit.
1949		Monteleone Criminal Sl. (rev. edn) 25: blazer A large diamond.

2. a hoax, a lie, a cheating trick; usu. as run a blazer (on/over) [it dazzles the victim].

1906

Springfield (MA) Weekly Republican 19 Apr. 1: The Kaiser’s telegram [...] recalls some of his blazers in the past [DA].

run a blazer (on/over) (v.)

to deceive, to trick.

1897		A.H. Lewis Wolfville 330: They’s runnin’ blazers on each other [...] an’ don’t mean nothin’.
1903		A. Adams Log Of A Cowboy 81: Are you sure you was n’t running a blazer yourself, or is it the wind merely rising?
1913		Van Loan ‘“Butterfly” Boggs: Pitcher’ in Lucky Seventh (2004) 250: What are you trying to do, Jake? Run a blazer on me?
1924		C.E. Mulford Hopalong Cassidy Returns 125: Don’t you try to run no blazer on me!
1931		O. Strange Law O’ The Lariat 167: No damn gang o’ cow-thieves can run a blazer on this crowd an’ get away with it.
1934		R.E. Howard ‘Scalp Hunter’ in Action Stories Aug. 🌐 This here dollar ain’t no good! [...] You can’t run no blazer over me! […] You gimme a real dollar, or else.