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.
CAPPACH, adj. “Toothless, chattering” (Mry.1 1925). [′kɑpəx]
[Gael. càbach, abounding in gaps, toothless (MacLennan), gap-toothed, from Gael. cab, a gap, which (according to MacBain) is based upon two Eng. words, gap and gab.]