"hummed" in the verb sense
1. hum
sing with closed lips
"She hummed a melody"
2. hum, buzz, seethe
be noisy with activity
"This office is buzzing with activity"
3. hum, thrum
sound with a monotonous hum
4. hum
make a low continuous sound
"The refrigerator is humming"
Source: WordNet® (An amazing lexical database of English)
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