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blow the gaff

slang To talk about or reveal a private or secret matter. Primarily heard in UK. I can't believe you blew the gaff and talked about the plans for her surprise party right to her face! Don't tell your little brother anything you want to keep secret because he'll definitely blow the gaff.
See also: blow, gaff

stand the gaff

Take severe criticism or other adversity in stride, as in If you can't stand the gaff, don't try running for office. [Slang; late 1800s]
See also: gaff, stand

blow the gaff

If you blow the gaff, you tell people something which was supposed to be kept secret. He is certainly not the first minister to blow the gaff. Note: `Blow' here means `reveal'. In the 19th century, `gaff' was a slang word used to refer to dishonest behaviour which was intended to deceive people.
See also: blow, gaff

blow the gaff

reveal or let out a plot or secret. British informal
The word gaff is recorded from the early 19th century, but its origins are uncertain.
See also: blow, gaff

blow the ˈgaff (on somebody/something)

(British English, informal) reveal a secret: She didn’t want anyone to know where she had been, but her husband blew the gaff. OPPOSITE: keep mum
See also: blow, gaff
References in periodicals archive ?
Gaff had not been served with a copy of the lawsuit by late last week.
Jake Gaff continued his impressive kicking form to put Billingham back in the lead by three points following a penalty kick on the 22.
In a second series of tests, the linemen were equipped with instrumented climbers for the purpose of recording gaff penetration and gaff impact values.
Should the contestants be "hung" together in a skein of feathers, the gaff of one impaling the other, the injured cock's handler wastes no time before plunging into the fray and deftly tugging at the tail feathers to extricate his charge.
Although the data suggest widespread agreement about the importance of these changes to achieve quality, Gaff thoughtfully points out "disagreement about whether requirements strengthen education by exposing students to areas they might not otherwise take or weaken quality by forcing students into classes they do not want to take.
We learned years ago, that it is possible if you remain calm, don't poke the fish prematurely with gaff or net, and wear it out before guiding it alongside.
Although what their gaff would look and smell like come Sunday morning if Ross County win today doesn't even bear thinking about.
The gaff riggers division saw a win for Gary Ferres' Intrepid from Reverie (John Barclay and Nigel Berlyn), with third place going to Hoana (Martin Van Der Wall), which took fastest time.
CANNONS were fired when a flotilla of Gaff Rig wooden boats sailed past Holyhead yesterday.
But try that lifestyle if you're a punter living in a housing estate in Paisley, instead of a rambling Highland gaff like theirs.
Mick Jagger's daughters, model Elizabeth Scarlett, 22, and 14-year-old Georgia May, were among the revellers at Rolling Stone Ronnie's pounds 12million Surrey gaff.
He took the Grade 3 Hal's Hope Handicap aboard On Thin Ice, the Listed Aventura Stakes on Doctor Decherd, and the Grade 3 Mr Prospector Handicap on Gaff.
She finished second to Samantha Gaff from Judge Memorial of Salt Lake City.
Luckily, the gaff must have hit the backbone because it didn't move at all once it was in the boat.
Gaff, Tree, 2-1/2 Inch, For Bashlin Bd-14 And Bd-16 Climbers.