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.
BILL-BLO, n. A bull.Lnk. 1806 J. Black Falls of Clyde 133:
D'ye think that our bill-blo Cares an ait-straw if ye hae faith or no?