Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
MU, n.2 Also mø (Jak.). Saliva, moisture of the mouth (Sh. 1914 Angus Gl.). [mu, mø]Sh. 1908 Jak. (1928):
De mu o' de mooth; to swallow de mu.