Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
DOLLY, n.3 A kind of round-ended mallet used by plumbers for widening the mouths of lead pipes (Sc. 1972 J. Hastings Plumber's Companion 67). [Cf. Dolly, n.2, and Eng. dolly, a stick for stirring, etc.]