On your mettle
Definition 1 of 1
Pro Tip 1/3Challenge Response
Use when you or someone else needs to respond well to a difficult challenge. 
With the final match tomorrow, the team must be on their mettle.
Pro Tip 2/3Positive Pressure
Implies positive stress or pressure to perform well, often before a known evaluation. 
You'll be on your mettle during the annual performance review.
Pro Tip 3/3Emotional Tone
Carries an encouraging tone to motivate someone facing a tough situation. 
The championship will put you on your mettle, but I believe in you!