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-DOOR, n. comb. “The lower half of a door divided in the middle; a trapdoor” (Sc. 1905 E.D.D.Suppl.).
[Cf. Eng. clap-door, a small door which shuts when slammed, or which swings to of itself, 1625 (N.E.D.), and Dan. klap, trapdoor.]
