The difference between Inner strength and Set of one's jaw
When used as nouns, inner strength means integrity of character, whereas set of one's jaw means the manner of one's lower facial expression, especially as suggesting firm resolve, or intensity of thought or feeling.
check bellow for the other definitions of Inner strength and Set of one's jaw
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Inner strength as a noun (idiomatic):
Integrity of character; resoluteness of will; mental resistance to doubt or discouragement.
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Set of one's jaw as a noun (set phrase):
The manner of one's lower facial expression, especially as suggesting firm resolve, or intensity of thought or feeling.