subs. (old).The head. [Properly an apple.] For synonyms, see CRUMPET.
1534. UDALL, Roister Doister, III., v., p. 58 (ARBER). I knocke youre COSTARDE if ye offer to strike me.
1605. SHAKESPEARE, King Lear, iv. 6. Edg. Nay, come not near th old man; keep out, che vor ye, or ise try whether your COSTARD or my bat be the harder.
1787. GROSE, A Provincial Glossary, etc. COSTARD, the head; a kind of opprobrious word, used by way of contempt, probably alluding to a costard apple.
1817. SCOTT, Rob Roy, ch. xii. Its hard I should get raps over the COSTARD.