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Definition knuckle in British English

knuckle verb

verb
/ˈnʌk(ə)l/
1

to start working hard, especially when you should have done this earlier

Example

It’s time you knuckled down to some work.

Synonyms and related words
2

to do what someone tells you to do

Example

He wasn’t going to knuckle under to some woman.

Synonyms and related words
Definition knuckle in British English