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