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.
†CLAP-DYKE, n. comb. An earthen dyke or fence, “so called, because they are clapped with a spade, to make them solid” (Sc. 1813 N. Carlisle Topog. Dict. Scot., Gl.).
[See Clap, v., 2.]