(1):

(v. t.) To form or bend into the shape of an arch.

(2):

(n.) Any part of a curved line.

(3):

(n.) Usually a curved member made up of separate wedge-shaped solids, with the joints between them disposed in the direction of the radii of the curve; used to support the wall or other weight above an opening. In this sense arches are segmental, round (i. e., semicircular), or pointed.

(4):

(n.) A flat arch is a member constructed of stones cut into wedges or other shapes so as to support each other without rising in a curve.

(5):

(n.) Any place covered by an arch; an archway; as, to pass into the arch of a bridge.

(6):

(n.) Any curvature in the form of an arch; as, the arch of the aorta.

(7):

(a.) Chief; eminent; greatest; principal.

(8):

(v. t.) To cover with an arch or arches.

(9):

(v. i.) To form into an arch; to curve.

(10):

(n.) A chief.

(11):

(a.) Cunning or sly; sportively mischievous; roguish; as, an arch look, word, lad.