Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
†COSH, adj.2 Placed over a hollow, having a hollow underneath.Kcb. 1825 Jam.2, s.v. tosch:
To lay a piece of wood cosh on the ground in order to its being broken, is to place it in such a way that there may be a hollow place under that part of it at which it is meant to give the stroke.