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.
¶BEL-RUE, n. In phr. to sing bel-rue, to regret, lament one's mistakes or misfortunes.Abd. 1824 G. Smith Douglas 86:
He's gi'en me cause to sing bel-rue.
[The first element is obscure; the second is Eng. rue.]