mettle
Concise Oxford English Dictionary © 2008 Oxford University Press:
mettle/ˈmetl/
▶noun a person's ability to cope with difficulties; spirit and resilience.
– phrases
be on one's mettle be ready or forced to do one's best.
be on one's mettle be ready or forced to do one's best.
– derivatives
mettlesome adjective.
mettlesome adjective.
'mettle' also found in these Oxford entries:

