Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII). Includes material from the 1976 supplement.
This entry has not been updated since then but may contain minor corrections and revisions.
PUMP, n.2, v.2 Also pimp.
I. n. A breaking of wind (Sc. 1808 Jam., 1916 Slang of Venery II. 67; Abd.27 1950, pimp). Gen.Sc. slang or colloq.
II. v. To break wind softly (Sc. 1808 Jam., 1916 Slang of Venery II. 67; Abd. 1950, pimp).Peb. 1817 R. Brown Lintoun Green 175:
That often frets, foams, draunts, and pumps [of a horse].