fay

Fay \Fay\, v. i. (Shipbuilding) To lie close together; to fit; to fadge; -- often with in, into, with, or together. [1913 Webster] {Faying surface}, that surface of an object which comes with another object to which it is fastened; -- said of plates, angle irons, etc., that are riveted together in shipwork. [1913 Webster]