knuckle joint

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knuckle joint

The mechanic inspects the knuckle joint of the robotic arm.

Definition
  1. Noun:
    • A mechanical joint allowing movement in one plane only: A pin joint, often used in engineering, that connects two rods or parts and permits angular movement in a single plane, like a hinge.
    • A joint of a finger when the fist is closed: Specifically refers to any of the joints where the fingers bend, particularly the prominent ones visible when a hand is clenched into a fist.
Usage Examples
  • Noun (Anatomical):
    • He bruised his knuckle joint while boxing.
    • Arthritis can cause pain and swelling in the knuckle joints.
  • Noun (Mechanical):
    • The robot's arm utilizes a knuckle joint for precise, hinged movement.
    • The design incorporates a durable knuckle joint to connect the two levers.
Advanced Usage
  • "To rap someone's knuckles": To reprimand or punish someone lightly. (This idiom refers to the anatomical knuckle joint).
    • The teacher rapped his knuckles for talking in class.
  • In mechanical contexts, a knuckle joint is a specific type of pin connection designed to handle tensile loads while allowing a pivoting motion.
Variants and Related Words
  • Knuckle (n): The rounded prominence of a bone, especially at a finger joint; or the part of a hinge through which the pin passes.
    • He cracked his knuckles.
  • Knuckled (adj): Having knuckles.
    • His large, knuckled hands.
  • Knucklebone (n): A bone forming or corresponding to a knuckle.
Synonyms
  • Finger joint (for the anatomical meaning).
  • Hinge joint (for the mechanical meaning).
  • Metacarpophalangeal joint (MCP joint) (technical term for the major knuckle joint connecting the hand to the fingers).
Related Phrases
  • Knuckle down: To begin to work hard and seriously.
    • You need to knuckle down and study for your exams.
  • Knuckle under: To submit or yield to authority or pressure.
    • After a long argument, he finally knuckled under.
Related Idioms
  • White-knuckle: Describing a very frightening or tense experience, from the idea of gripping so hard one's knuckles turn white.
    • It was a white-knuckle ride on the roller coaster.
  • Near the knuckle (BrE): Risqué or verging on the indecent or offensive.
    • Some of his jokes were a bit near the knuckle.
knuckle joint

The mechanic inspects the knuckle joint of the robotic arm.

Noun
  1. a joint allowing movement in one plane only
  2. a joint of a finger when the fist is closed

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