[hum] vb hummed ; hum.ming [ME hummen; akin to MHG hummen to hum, MD hommel bumblebee] vi (14c) 1 a: to utter a sound like that of the speech sound /m/ prolonged b: to make the natural noise of an insect in motion or a similar sound: drone c: to give forth a low continuous blend of sound
2. a: to be busily active "the museum hummed with visitors" b: to run smoothly "the business started to ~" ~ vt 1: to sing with the lips closed and without articulation
2: to affect or express by humming "hummed his displeasure" -- hum n -- hum.ma.ble adj
[2]hum chiefly Brit var of hem