Emily Dickinson Lexicon

HUM, n.

1. The noise of bees or insects
2. A low confused noise, as of crowds; as, the busy hum of men. Milton.
3. Any low dull noise. Pope.
4. A low inarticulate sound, uttered by a speaker in a pause; as, hums and haws. Shak. Dryden.
5. An expression of applause. Spectator.