Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
TOUT, n.3 A potato. Comb. tout soup, and in quasi-pl. form tuse-soup, potato soup (Edb. 1857 F. W. Belford Heriot's Hosp. 345). Heriot's Hosp. slang.Edb. 1898 J. Baillie W. Crighton 37:
The big cook had great credit for her “tout soup”. . . . “Pea claw,” “cone,” “touts” and “chit.”