Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
GLAP, n. “A sudden attack of illness, espec. of cold; e.g. ‘l got a glap o' cald last week wi' sitting i weet claes'” (Ork. 1929 Marw.). [glɑp]
[Origin doubtful: phs. a variant of Clap, n.1, a heavy blow, a stroke.]