Phrasal verbs starting with "knuckle"

To begin working hard and seriously, especially after a period of distraction or laziness.

To submit or yield to authority, pressure, or someone's will; an archaic variant of 'knuckle under'.

To yield to authority, threats, or superior force after resisting; to submit reluctantly.

To raise one's fists in preparation for a fistfight; to prepare to fight.