Definition of be on one's mettle in English:

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be on one's mettle

Be ready or forced to do one’s best in a demanding situation: Saturday’s game will be a tricky one and we’ll have to be on our mettle from the start
More example sentences
  • York were on their mettle from the off and led 22-13 at the five ends stage with two rinks winning and two rinks drawing.
  • As someone who has hitherto needed to reject one thing before moving on to another, Juliet is on her mettle, and she knows it.
  • After the first-half performance it is not a bad point because no matter who you are playing against you have got to be on your mettle for 90 minutes.
See parent entry: mettle
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