The difference between Belly up to the bar and Knuckle down
When used as verbs, belly up to the bar means to commit oneself to a challenge or task, whereas knuckle down means to get to work.
check bellow for the other definitions of Belly up to the bar and Knuckle down
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Belly up to the bar as a verb (chiefly, US, idiomatic):
To commit oneself to a challenge or task; to accept a responsibility; to acknowledge a fact.
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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.