Definition of prove one's mettle
: to prove how tough one is
- He proved his mettle as a fighter tonight.
prove one's mettle
idiom
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prove
play
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: to learn or find out by experience
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: to test the truth, validity, or genuineness of
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: to test the worth or quality of
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mettle
play
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: vigor and strength of spirit or temperament (see temperament 1a)
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: staying quality : stamina
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: quality of temperament or disposition
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