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Knuckle down phrasal verb
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Meaning: Make a great effort
(Intransitive | International English)
» Example: I've got my exams next week and I haven't done much work, so I'd better KNUCKLE DOWN.
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Meaning: Make a great effort
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Knuckle under phrasal verb
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Meaning: Submit to authority
(Intransitive | International English)
» Example: The teacher made the students KNUCKLE UNDER and hand their projects in on time.
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Meaning: Submit to authority