Green’s Dictionary of Slang

mistake n.

[euph.]

an unplanned pregnancy and the child that follows.

[UK]C. MacInnes City of Spades (1964) 27: Arthur was Mum’s mistake before she met our Dad.
[Ire]C. Brown Down All the Days 89: Put your little mistake on the sofa there.

SE in slang uses

In phrases

and no mistake (also and no mistake about it, make no mistake)

a general intensifier, certainly, without any doubt.

[UK]Sussex Advertiser 14 Apr. 4/3: He backed himself to wein [...] he meant winning, nothing else, ‘and no mistake’.
[UK]W.T. Moncrieff Heart of London III iii: covey: What, my little dealer in lace and chapman, Jemmy? james: Andrew Covey! covey: And no mistake!
[UK] ‘Gallery of 140 Comicalities’ Bell’s Life in London 24 June 2/2: A nice cove this, and no mistake!
[bk title] Regular Thing, And No Mistake.
[Aus]Sydney Herald 18 June 4/2: [A]s you sport the tip top slang, as you should tip us the office to gammon the queer uns, so up and give it ’em right and left and no mistake.
[UK]Comic Almanack Feb. 352: [illus.] It’s quite awful and no mistake.
[UK]A. Smith Natural History of the Gent 42: On this dog-cart were four Gents [...] Three had cigars, and the other had a horn; and it was evident that they thought they were ‘doing the fast thing, and no mistake’.
[UK]F.E. Smedley Frank Fairlegh (1878) 40: A jolly dodge for a shower of rain, and no mistake.
[US]Glasgow Wkly Times (MO) 19 Nov. 1/5: I love you to distraction and no mistake.
[UK](con. 1840s–50s) H. Mayhew London Labour and London Poor I 417/2: Tip-top swells used to come among us, and no mistake.
[UK]C. Hindley Life and Adventures of a Cheap Jack 171: Oh, you’ll have a rare houseful, and no mistake about it.
[UK]C. Deveureux Venus in India I 41: You are a good poke! and no mistake!
[UK]Boy’s Own Paper 3 Dec. 149: Hurrah! [...] we’ve done it at last, and no mistake!
[US]C. Chesnutt House Behind The Cedars (1995) 117: I wuz jes’ glad to see you gettin’ ’long so fine, dat I wuz, certain sho’ an’ no mistake about it.
[UK]H.G. Wells Hist. of Mr Polly (1946) 191: But he’s a Scorcher and no Mistake ... Gramma don’t like him.
[US]M. Glass Potash and Perlmutter 17: He’s got us, Barney. Louis Grossman’s got us and no mistake.
[Ire]Joyce Ulysses 291: So they started arguing about the point, Bloom saying he wouldn’t and couldn’t and excuse him no offence and all to that and then he said well he’d just take a cigar. Gob, he’s a prudent member and no mistake.
[UK]B. Bunting ‘The Well of Lycopolis’ in Complete Poems 37: Whatever I may have done at other times / on the sly / I was in love then and no mistake.
[UK]J. Maclaren-Ross Of Love And Hunger 205: You’re a cool customer. And no mistake.
[UK]W. Hall Long and the Short and the Tall Act II: They saw you coming, and no mistake.
[UK]N. Armfelt Catching Up 106: We’ll see some horticulture in Waitapa, make no mistake!
[Ire]P. McCabe Butcher Boy (1993) 138: I’d give her the johnny and no mistake.
[US]J. McCourt ‘Vilja de Tanquay Exults’ in Queer Street 306: Just then what some bleedin’ dreary-sof Jerry / Jad to say [...] / Got up / My nose an no mistake.
[Scot]V. McDermid Out of Bounds (2017) 23: That’d piss on your chips and no mistake.