Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
PLEP, n. “Anything weak or feeble” (n.Sc. 1808 Jam.). Hence pleppit, adj., limp, flaccid; of cloth: creased, unstiffened, worn-out (Ib.).
[Phs. a variant of Plaip, to flap, sc. of something limp, hanging loosely.]