#1 arch v. [curve, arc] form an arch or curve; "her back arches"; "her hips curve nicely". wn
#2 arch n. a curved shape in the vertical plane that spans an opening. wn
#3 arch n. a curved bony structure supporting or enclosing organs (especially the inner sides of the feet). wn
#4 arch s. [condescending, patronizing, patronising] (used of behavior or attitude) characteristic of those who treat others with condescension. wn
#5 arch s. expert in skulduggery; "an arch criminal". wn
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