✨📕 The NEW Collegiate Dictionary, 12th Edition Over 5,000 words added — Learn More!
✨📕 The NEW Collegiate Dictionary — Learn More!

upon my word

phrase

: with my assurance : indeed, assuredly
Upon my word, I've never heard of such a thing.

Browse Nearby Words

upon further review of
upon my word
upon/on someone's return
See all Nearby Words

Cite this Entry

“Upon my word.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/upon%20my%20word. Accessed 21 Dec. 2025.

Copy Citation

Share

Last Updated: - Definition revised
Love words? Need even more definitions?

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

Popular in Grammar & Usage

See More

How to Use 'Who' vs. 'Whom'

'Affect' vs. 'Effect'

The Difference Between 'i.e.' and 'e.g.'

What’s the difference between ‘cemetery’ and ‘graveyard’?

Democracy or Republic: What's the difference?
See More

Popular in Wordplay

See More

Ten Kinds of Happiness

The Words of the Week - Dec. 19

17 Words for Dog Breeds

Birds Say the Darndest Things

Even More Bird Names that Sound Like Insults (and Sometimes Are)
See More

Popular

See More

How to Use 'Who' vs. 'Whom'

Ten Kinds of Happiness

The Words of the Week - Dec. 19
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
naughty or nice
Are you naughty or nice? Quiz He's making a quiz, and checking it twice...
See All