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That'll be the day Meaning in English

expression

ˈðætəɫ/ /ˈbi/, /bi/ /ˈðə/, /ðə/, /ði/ /ˈdeɪ
THAT-uhl bee thuh DAY
ˈðætl̩/ /bˈiː/ /ðə, ði/ /dˈeɪ
THAT-l bee thuh DAY

释义

This expression is used to say that something is very unlikely or will never happen, often in a sarcastic way.

用法与细微差别

Informal, often said with humor or sarcasm when someone suggests something implausible. Similar to 'when pigs fly'. Not used in formal writing.

例句

"You think he'll wake up early on a Sunday? That'll be the day!"

basic

If she ever apologizes, that'll be the day.

basic

"Mom, will you buy me a car?" "That'll be the day!"

basic

He said he's going to quit junk food and start running every day. That'll be the day!

natural

If they ever agree on anything, that'll be the day.

natural

Oh, you're going to stop teasing your little brother? That'll be the day!

natural