knuckle
This term evokes a sense of hardness and structural rigidity, referring to the bony protrusions of the finger joints. It is frequently associated with physical impact, such as "white-knuckled" grip indicating extreme tension or fear, or the act of striking someone.
When used as a verb in the phrasal form "knuckle down," the word shifts from a physical description to a psychological state of discipline and intense focus. This transition suggests a grounding effect, as if one is physically bracing themselves to tackle a difficult task.
Meanings
The joint of a finger where the bone bends.
He accidentally scraped his knuckle against the wall.
The joint of a finger when the hand is closed into a fist.
She cracked her knuckles while waiting for the meeting to start.
A joint or a rounded protrusion resembling a finger joint, such as in a mechanical linkage.
The technician inspected the knuckle joint of the steering system.
Phrasal Verbs
knuckle down
to begin working hard or focusing seriously on a task
After weeks of procrastination, he finally decided to knuckle down and study for the exam.
knuckle under
to yield or submit to pressure or authority, typically after resisting
The government refused to knuckle under to the demands of the protesters.