Phrasal Verb 'knuckle'

We have 2 phrasal verb definition related to 'knuckle'.

Knuckle down

Meaning:

Make a great effort

Example:

I've got my exams next week and I haven't done much work, so I'd better KNUCKLE DOWN.

Knuckle under

Meaning:

Submit to authority

Example:

The teacher made the students KNUCKLE UNDER and hand their projects in on time.