Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
CLAISACH, adj. “Deceiving, insincere” (Cai.8 1934). [′klesəx]
[Gael. cleasach, cleasaiche, crafty, full of schemes or tricks (Macleod and Dewar).]