Green’s Dictionary of Slang

blag n.

[? SE blackguard]

1. (also blag job, blague) robbery, often with violence, esp. of a bank or post office.

[UK]Sessions Papers n.p.: There has been another blag down round here [DU].
[UK]J. Curtis Gilt Kid 22: I’ve let myself in for screwing the Bank of England or doing a blag on the crown jewels.
[UK]F.D. Sharpe Sharpe of the Flying Squad 329: Smash and grab raiding is described as ‘The Blague’ or ‘The Smash.’ (‘Billy is at the blague’ – Billy is smash and grab raiding).
[UK]V. Davis Phenomena in Crime 138: A ‘blag’, which means snatching from the counter.
[UK]B. Hill Boss of Britain’s Underworld 31: Now blagging is robbery with violence [...] There were many advantages in blags. First, most blags are done for hard cash .
[UK]B. Hill Boss of Britain’s Underworld 5: We never wore disguises [...] It’s amazing how few people recognise you on a blag job.
[UK]F. Norman Bang To Rights 10: Some geezer, who [...] had been captured on a blag down the west.
[UK]G.F. Newman Sir, You Bastard 71: A blag was done up the road.
[UK]G.F. Newman A Prisoner’s Tale 16: He would have taken his nicking had he really been involved in the blag and it had come on top.
[UK](con. 1950s–60s) in G. Tremlett Little Legs 38: The only things the Old Bill have ever captured me for are blags and deception.
[Ire]P. Howard The Joy (2015) [ebook] He never seemed to flash any of the sponds he claimed to earned from various ‘job’ and ‘blags’.
[UK]N. Barlay Hooky Gear 181: Me an him is gonna pull off one of the biggest blags in the history of crime. [Ibid.] 182: I tell them about the Wealdstone corner shop blag of ’94, the biggest confectionery haul of the last millennium. It was well sweet.
[UK]N. ‘Razor’ Smith Raiders 111: You can’t do as many armed blags as I have done and expect to reign for ever.

2. bag-snatching, watch-stealing.

[UK]Partridge DSUE (8th edn) 90/2: since ca. 1920.

3. a wages snatch.

[UK]Partridge DSUE (8th edn) 90/2: since late 1930s.

4. (orig. UK Und.) a persuasive if lying story.

[[UK]Luton Times 24 Apr. 8/5: Cave, adsam; you understand me, / Drop them, abandon blague and cant, / And tell me plainly what you want].
[UK]R. Cook Crust on its Uppers 15: This is no blag [...] it’s a tale of someone who wanted to go and go.
[UK]‘Derek Raymond’ He Died with His Eyes Open 24: Next time you just throw any old unverified blag off on me over a case I’m handling, you might just have a stumble on your next flight to the top.
[UK]G. Burn Happy Like Murderers 185: Making a monkey out of. Pulling the wool over. Putting one over on. The chisel. The blag.
[UK]B. Hare Urban Grimshaw 54: Everyone was on the make [...] pulling a blag.

5. (Irish) an oppprtunity for crime.

[Ire]P. Howard The Joy (2015) [ebook] ‘[I]t’s instinct [...] being able to spot a switch when it was going down, spot a blag, an opening, an opportunity’.

In compounds