That'll be the day! Theme: BELIEF exclam. “That will never happen!”You win a medal? That'll be the day!When he gets his own car—that'll be the day!
Idiom That'll be the day! something that you say in order to show you think an event or action is not likely to happen.A pay rise? That'll be the day!
that'll be the day! used of something that is not very likely to occur or be done AUSTRALIA, 1941
idiomthat'll be the day!spoken said when you think that something is very unlikely to happen:"Does he spend a long time doing his homework?" "That'll be the day!"That'll be the day - when Bridget decides to get married.
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