Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
This entry has not been updated since then but may contain minor corrections and revisions.
BE DA BYE, phr. By the bye. [bi də bɑɪ]Sh.(D) 1918 T. Manson Humours Peat Comm. I. 159:
I'm com ta aks dee — be da bye, whaars Aandrew?