Longman Dictionary of Contemporary English homepage

knuckle

2 verb
     
knuckle2

knuckle down

phrasal verb
to suddenly start working or studying hard [= get down to]:
If he doesn't knuckle down soon, he'll never get through those exams.
knuckle down to
He is clearly ready to knuckle down to the task.

knuckle under

phrasal verb
to accept someone's authority or orders although you do not want to
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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