that'll be the day


Also found in: Acronyms, Wikipedia.

that'll be the day

Said of something that is unlikely to happen. A politician speaking the truth? Ha, that'll be the day!

That'll be the day!

Inf. It will be an unusually amazing day when that happens! Bill: I think I'll fix that lamp now. Andy: When you finally get around to fixing that lamp, that'll be the day! Sue: I'm going to get this place organized once and for all! Alice: That'll be the day!

that'll be the day

That will never happen, that's very unlikely, as in You think I'll win the lottery? That'll be the day! Presumably this phrase is short for that will be the day worth waiting for, but it is nearly always used ironically, as in the example. [Mid-1900s]

that'll be the day

COMMON People say that'll be the day to show that they think that something will never happen. `He says he's going to decorate his house.' — `Hah. That'll be the day.'

that will be the day

something is very unlikely to happen. informal
1991 Alistair Campbell Sidewinder ‘Now for my proposal, which you'll find irresistible.’ ‘That'll be the day.’
See also: that, will

ˈthat’ll be the day

(spoken, ironic) used for saying that something is unlikely: ‘When I’m rich, I’ll buy you a new car.’ ‘That’ll be the day!’

That’ll be the day!

exclam. That will never happen! When he gets his own car—that’ll be the day!
References in periodicals archive ?
THEATRE That'll Be The Day Highly acclaimed for its stunning live entertainment, That'll Be The Day is an outstanding celebration for all true fans of the golden era of popular music.
That'll Be The Day Show raises |money for Make A Wish Foundation GET ready for a party as the UK's most successful Rock 'N' Roll variety show, the legendary That'll Be The Day, returns to Venue Cymru, Llandudno with its Brand New 2014 Christmas Show
The Crickets had a UK No 1 single with That'll Be The Day 3.
Number 1 album THE original soundtrack to That'll Be The Day was spending its last week at no.
Although aged just 22 when he died, his music has lived on in such classics as Peggy Sue, Oh Boy, Rave On, Heartbeat, Raining In My Heart and the aforementioned That'll be the day.
He wrote and created musical show That'll Be The Day, and still directs, produces and stars in the production.
Love Me A rock 'n' roll toe-tapper, co-written by Holly and Mitchell Parish, Love Me originally featured on the album That'll Be The Day.
ROCK 'N' ROLL back the years as top show That'll Be The Day returns to the Warwickshire stage.
Anderson is the star of That'll Be The Day, the rock'n'roll musical show which is currently touring the country.
THE hit show That'll Be The Day returns to Cardiff's St David's Hall on Friday with an all-new show, bring more than two hours of non-stop entertainment covering three decades of the best pop music.
He co-starred in That'll Be the Day (1973) as aTeddy Boy and appeared in The Last Waltz, the Martin Scorsese documentary film about the 1976 farewell concert of the Band.
BACK by huge demand, prepare for a party as the nations favourite rock 'n' roll variety show That'll Be The Day, returns with its brand new show
That'll Be The Day, The Playhouse, Whitley Bay A NOSTALGIC blitz through 50s, 60s and 70s pop culture, That'll Be The Day went down a storm at the Playhouse on Thursday night.
The live production brings to life classic hits such as Peggy Sue, That'll be the Day and Oh Boy.
ROCK `n' roll's journey through the 1950s,60s and 70s makes for an entertaining two and a half hour musical called That'll Be The Day.