Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
¶CAPPERSMAGHAN, n. A smart blow esp. on the head, a whack, smack (Per. a.1838 Jam. MSS. X. 35). [A nonce jocular formation, poss. based on cap and smack.]