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.
BIM, v. and n. [bɪm See P.L.D. § 60.1.]
1. v. “To hum; a variety of Bum” (Rnf. 1825 Jam.2).
2. n. “The act of buzzing” (Ib.).
Hence bimmer, “that which hums” (Ib.).