The difference between Pull one's socks up and Shape up
When used as verbs, pull one's socks up means to start making an effort, whereas shape up means to improve.
check bellow for the other definitions of Pull one's socks up and Shape up
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Pull one's socks up as a verb (idiomatic):
To start making an effort; to renew or redouble one's efforts.
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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."