Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.

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 ?
The Gaffs agreed in 2001 to stop distributing chemicals, including potassium chlorate and potassium perchlorate, to customers it knew were making illegal fireworks.
Hugh Treharne skippered Killala into fifth place in Gaff Riggers Division 2, unable to make up time on the front-markers after the handicap start.
Gaff believes that these products will allow it to become a force in the market for biological/medical related software tools and genetic identification services.
Gaff, who raced once in the US last year before winning the El Gran Senor Stakes over seven furlongs at Fairyhouse on his Irish debut, was tried over a mile on his reappearance at Leopardstown last month when he finished third of four behind Alayan and Grand Central.
Gaff was arrested and taken to the Lane County Jail.
Because of a high head-carriage, Gaff, which finished third to Alayan in the Leopardstown 2,000 Guineas Trial on his seasonal debut, has his detractors.
Gaff, who raced once at Keeneland in April when trained in the US, overcame trouble in running to beat previous winner Only Make Believe by half a length under Pat Smullen in the seven-furlong event and afterwards Weld was adamant the 6-1 shot's win had not been a surprise.
DOWN IN THE MOUTH: A marine scientist reaches between the shark's jaws with his arm in a protective tube to remove the gaff, inset, from its throat; TAKING PLUNGE: Rescue diver with hooked shark; PUTTING BITE ON JAWS: Shark is lured into bag; IN THE BAG: Shark is captured so it can be saved BARCROFT MEDIA
Unfortunately, the fish rolled and the gaff missed its mark.
Reappearing just nine days after his debut win at Naas, Footstepsinthesand is a top-priced 25/1 shot (Ladbrokes) for the 2005 English 2,000 Guineas following his convincing two lengths win over another smart colt Gaff in the Group 3 Killavullan Stakes.
Thinking quick, Pete instructed the team: Joe take over the rod, Craig back to handlining duties, Jim in the transom corner with backup gaff.
Meanwhile, American import Gaff gave Dermot Weld a timely boost when making a successful Irish debut in the listed El Gran Senor Stakes at Fairyhouse yesterday.
Roaring Riva was the first winner in Ireland for Cochrane, 28, who comes from Banbridge, County Down, while owner Billy Gaff was born at The Curragh.
Comedy at sea: A big halibut, a broken net, an annoying pelican and a borrowed hand gaff were key ingredients to a comical catch made Nov.
A flying gaff or a large straight gaff helps to subdue the fish once it gets close to the boat.