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on (one's) mettle

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met·tle   (mět'l)   
n.  
  1. Courage and fortitude; spirit: troops who showed their mettle in combat.

  2. Inherent quality of character and temperament.


[Variant of metal.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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