Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
†KNOW, v.2 Sc. usage in phr. to know to, to vouch for, to know or recognise (something) for.Inv. 1746 Trans. Gael. Soc. Inv. XXVI. 182:
A young lad . . . whose innocency I can pretty well know to.Fif. 1830 Perthshire Advert. (22 April):
She tasted it and knew it to rum.