Definitions

1. noun

The quality of being strong and determined; courage or spirit.

“Her mettle was tested when she had to give a speech in front of a large audience.”

2. noun

A material or mixture of materials, especially metal, for use in making something.

“The engineer analyzed the properties of the metal to determine the best alloy for the project.”

3. verb

To test or prove the strength or courage of someone or something.

“The coach was determined to mettle her team and push them to their limits.”