Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
¶THEITHEIK, n. A hard blow (Ayr. c.1850 Crawfurd MSS. (N.L.S.) T. 109, “a Largs word”).
[Orig. obscure. The word may not be authentic.]