prove one's mettle

idiom
Updated on: 15 Nov 2017

Definition of prove one's mettle

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

Word by Word Definitions

prove play
  1. : to learn or find out by experience

  2. : to test the truth, validity, or genuineness of

  3. : to test the worth or quality of

mettle play
  1. : vigor and strength of spirit or temperament (see temperament 1a)

  2. : staying quality : stamina

  3. : quality of temperament or disposition


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