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1 that'll be the day
expr excl infml"You'll come crawling to me in the end!" "That'll be the day!" — "Ты еще приползешь ко мне" - "Навряд ли"
"He invites us all to a party at his own house" "That'll be the day!" — "Он приглашает нас всех к себе домой" - "Не может быть!"
The new dictionary of modern spoken language > that'll be the day