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knuckle down to (something)▼verb[UK: ˈnʌk.l̩ daʊn tuː ˈsʌm.θɪŋ] [US: ˈnʌk.l̩ ˈdaʊn ˈtuː ˈsʌm.θɪŋ]
knuckle to (something)▼verb[UK: ˈnʌk.l̩ tuː ˈsʌm.θɪŋ] [US: ˈnʌk.l̩ ˈtuː ˈsʌm.θɪŋ]
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