swear up and down

idiom

Definition of swear up and down

US
: to state (something) very strongly and sincerely : to insist She swore up and down(that) she didn't do it.

Comments on swear up and down

What made you want to look up swear up and down? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

likely to have or produce good results

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

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!