know for a fact

idiom

Definition of know for a fact

: to be certain I know for a fact that he did it.

Learn More About know for a fact

Dictionary Entries Near know for a fact

know/feel in one's bones

know for a fact

know-how

See More Nearby Entries 

Statistics for know for a fact

Cite this Entry

“Know for a fact.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know%20for%20a%20fact. Accessed 22 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon
Seen & Heard
People are talking about

WORD OF THE DAY

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!