Don’t I Know It

Meaning of Idiom ‘Don’t I Know It’

Don’t I know it‘ is a response to someone telling you something that you already know quite well, or a way of expressing your awareness of a certain fact or situation.

Often, it means “Unfortunately, I’m aware” or “I’m all too aware of it.” Other times, it is an expression of simple agreement or acknowledgment.


“It must be a hundred degrees out there,” said Vince. “Don’t I know it!” said Bobby.

“Looks like the boss is on a warpath today,” said Becky. “Don’t I know it, replied Fran, “he chewed me out for being two minutes late!”

“I stayed out in the sun too long and got a bad sunburn, and don’t I know it today!”


The idiom began to be used during the mid-1800’s.

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