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3. prove mettle

prove mettle

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prove your mettle

(slightly formal) also show your mettle

to show that you are brave and have a strong character As a reporter, she certainly proved her mettle working in the midst of a war zone.

See also: mettle, prove

prove/show your mettle

  (slightly formal)

to prove that you are good at doing something by succeeding in a difficult situation A relative newcomer to the game, he's certainly proved his mettle in the last two games.

See also: mettle, prove