don't I know it

English

Etymology

A rhetorical question.

Interjection

don't I know it

(informal) I know; I am very familiar with it (some stated fact).
- 1927 April, Boys' Life, page 16:
  "Here's your shirt," said Slippery. "Make it snappy, we're late."
  "Don't I know it," replied the Owl, emerging from the closet with his dinner jacket and vest […]

Further reading

“don't I know it”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
“don’t I know it!”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.

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