(1):

(v. t.) To cut to a dovetail.

(2):

(v. t.) To join by means of dovetails.

(3):

(v. t.) To fit in or connect strongly, skillfully, or nicely; to fit ingeniously or complexly.

(4):

(n.) A flaring tenon, or tongue (shaped like a bird's tail spread), and a mortise, or socket, into which it fits tightly, making an interlocking joint between two pieces which resists pulling a part in all directions except one.