The difference between Knuckle down and Shape up
When used as verbs, knuckle down means to get to work, whereas shape up means to improve.
check bellow for the other definitions of Knuckle down and Shape up
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Knuckle down as a verb (intransitive, chiefly, British, idiomatic):
To get to work; to focus on a task.
Examples:
"You should knuckle down and do your homework!"
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Knuckle down as a verb:
To submit; knuckle under.
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Shape up as a verb (intransitive, idiomatic):
To improve; to correct one's bad habits or behavior.
Examples:
"He'd better shape up soon, or he'll fail the class."
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Shape up as a verb (intransitive, idiomatic):
To take shape; to transform into or become.
Examples:
"The fog has vanished and it's shaping up to be a beautiful day."