Dictionary of the Scots Language
Dictionar o the Scots Leid

Scottish National Dictionary (1700–)

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BOO, Bu, n.⁵ A spell of weather, either fine or bad. [bu:] Sh. 1866  Edm. Gl.:
“A boo of waddir,” meaning a long track of weather, good or bad. Sh. 1908  Jak. (1928):
He “set in” a bu fae (frae) de sooth-east, more settled weather set in with wind from the south-east.