a. [f. vbl. phrase stick in: see STICK v. 30.] That is inserted. Stick-in piece: a small piece of metal sometimes inserted in the notched ends of bars when making a butt-joint.
1843. Holtzapffel, Turning, I. 221. The butt joint is materially strengthened, when … it is … notched in on three or four sides, and pieces called stick-in pieces, dowels, or charlins … are … laid in the notches.
