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.
†PIMPLE, v. Nonce Sc. usage, of a simmering liquid: to form into bubbles, seethe, to Papple, q.v.Per. 1766 H. Robertson School of Arts 110:
Disturb it as little as possible; let it stand till it [milk] just pimple up; don't let it boil.