Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
UIR, v. To hum a tune (Ork. 1929 Marw.). [ør]
[Prob. partly imit., partly an intensive variant of Ue, q.v. See R, letter, 2.]