hum
A hummed tune, i.e. created orally with lips closed.
Other meanings
An often indistinct sound resembling human humming.
Busy activity, like the buzz of a beehive.
Example sentences
Word history
From Middle English "hummen".
Where this comes from
This definition is adapted from “hum” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above, published under CC BY-SA 4.0. This page is published under the same licence.