Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
†DO, DOE, n. A schoolboy word for a piece of bread, oatcake, etc. carried as a snack (Fif., s.Sc. 1808 Jam.). For phr. coss a doe, see Cose. [do:]
[Origin obscure.]