prove one's mettle

phrase

: to prove how tough one is
He proved his mettle as a fighter tonight.

Browse Nearby Words

prove one's manhood
prove one's mettle
prove oneself
See all Nearby Words

Cite this Entry

“Prove one's mettle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/prove%20one%27s%20mettle. Accessed 10 Mar. 2026.

Copy Citation
Love words? Need even more definitions?

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

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of mea culpa

See Definitions and Examples »

Popular in Grammar & Usage

See More

More Words You Always Have to Look Up

5 Verbal Slip Ups and Language Mistakes

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

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

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

Popular in Wordplay

See More

The Opposite of Déjà Vu

Was 'nervous Nellie' a Real Person?

Why do we call it a 'flea market'?

17 Words for Dog Breeds

Birds Say the Darndest Things
See More

Popular

See More

More Words You Always Have to Look Up

The Opposite of Déjà Vu

Was 'nervous Nellie' a Real Person?
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
child-with-a-telescope
Spot the Misspelled Word Quiz March 2026 Guage your ability to identify out-of-place letters.
See All