hum
- sense 1: sing with closed lips; "She hummed a melody"
- hum
- sing
- talk speak utter mouth verbalize verbalise
- communicate intercommunicate
- sense 2: be noisy with activity; "This office is buzzing with activity"
- hum buzz seethe
- sense 3: sound with a monotonous hum
- hum thrum
- sense 4: make a low continuous sound; "The refrigerator is humming"
- hum