upon my word

phrase

: with my assurance : indeed, assuredly

Upon my word, I've never heard of such a thing.

Cite this Entry

Style

“Upon my word.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/upon%20my%20word. Accessed 9 Oct. 2026.

Copy Citation

More from Merriam-Webster

Word of the Day

inscrutable

See Definitions and Examples »

Get Word of the Day daily email!

Popular in Grammar & Usage

Do You Need a New Language Peeve?

The Exceptions of '-s' and '-es' Plurals

Merriam-Webster’s Great Big List of Words You Love to Hate

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Popular in Wordplay

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't

7 Words for Bad Endings and Rough Situations

The Words of the Week - Oct. 9

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

Popular

Do You Need a New Language Peeve?

The Real Origin of 'Supercalifragilistic'

9 Words That Sound Like Insults But Aren't