arch definition

1. a curved shape in the vertical plane that spans an opening
2. a curved bony structure supporting or enclosing organs (especially the inner sides of the feet)
3. a passageway under a curved masonry construction
• examples: they built a triumphal arch to memorialize their victory
4. (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it
5. form an arch or curve
• examples: her back arches
• examples: her hips curve nicely
6. (used of behavior or attitude) characteristic of those who treat others with condescension
7. expert in skulduggery
• examples: an arch criminal
8. naughtily or annoyingly playful
• examples: teasing and worrying with impish laughter
• examples: a wicked prank