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.
BLUE-DO, n. 1. In colloq. or slang usage: a poor performance, something conspicuous for lack of success, any enterprise which looks like being a failure, a black outlook. Gen.Sc.ne.Sc. 1975:
If they ging on inflatin this wey, it's a blue do for us a'.
2. Jocularly by transf.: an indigo-blue dyehouse (Dmb. 1969). [Cf. Eng. slang do, a performance, a success.]
