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.
BOTTOM, n. Sc. usage: a thorough cleaning (Ags. 1975).Bwk. 1969:
We gie the house a bottom every Seturday.
[From the notion of getting to the bottom of (anything). Cf. Eng. dial. bottom (a ditch), to clean out thoroughly.]