Bum, v. i. [imp. & p. p.Bummed (�); p. pr. & vb. n.Bumming (�).] [See Boom, v. i., to roar.] To make murmuring or humming sound. Jamieson.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.