definition of
arch

[1] #1 arch v. [curve, arc] form an arch or curve; "her back arches"; "her hips curve nicely". wn

[2] #2 arch n. a curved shape in the vertical plane that spans an opening. wn

[3] #3 arch n. a curved bony structure supporting or enclosing organs (especially the inner sides of the feet). wn

[4] #4 arch s. [condescending, patronizing, patronising] (used of behavior or attitude) characteristic of those who treat others with condescension. wn

[5] #5 arch s. expert in skulduggery; "an arch criminal". wn