The difference between Buckle down and Knuckle down
When used as verbs, buckle down means to put forth the needed effort, whereas knuckle down means to get to work.
check bellow for the other definitions of Buckle down and Knuckle down
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Buckle down as a verb (idiomatic):
To put forth the needed effort; to focus; become serious; apply oneself (e.g. to work or study).
Examples:
"If he would buckle down and do his homework, he could be an excellent student."
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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.