the.com/mettle

the grit that shows up only after comfort taps out and quits

means a person's courage, resilience, and strength of character, especially as tested under pressure

from Originally just a variant spelling of "metal" — the two words were interchangeable for centuries. The figurative sense (the "stuff" a person is made of, like the quality of a blade's steel) gradually peeled off into its own spelling, so that by around the 18th century "mettle" carried the temperament while "metal" kept the ore.

twin word
Originally just a variant spelling of metal
proving it
Tested by fire, not by sunny days
horse roots
Once described a spirited horse's fighting temperament
on your
The idiom means rising to a hard challenge
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