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on one's mettle

Definition of on one's mettle

chiefly British

  1. :  making an effort to do as well as possible <She'll have to be on her mettle to win this competition.>



Word by Word Definitions

mettleplay
  1. :  vigor and strength of spirit or temperament

    :  staying quality :  stamina

    :  quality of temperament or disposition


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immature or lacking adult sophistication

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