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.
CLAPS, n.pl. Jaws. Cf. Clap-door, and slang Eng. trap, mouth.Ork.(D) 1880 Dennison Orcad. Sk. Bk. 61:
Dorin' on your claps! I ha'e naithin' tae gae you.