Arch

a curved shape in the vertical plane that spans an opening

a curved bony structure supporting or enclosing organs (especially the inner sides of the feet)

a passageway under a curved masonry construction

(architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it

form an arch or curve

(used of behavior or attitude) characteristic of those who treat others with condescension

naughtily or annoyingly playful