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that'll be the day
Language:
en
1.
US
UK
Canada
Australia
informal
colloquial
An expression of strong doubt or disbelief that a particular event will ever happen; 'I'll believe it when I see it.'
2.
US
UK
informal
idiomatic
humorous
Used jocularly or emphatically to refer to a hypothetical future day when a notable or unlikely event occurs.
Examples:
No examples available.
Validation Count:
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