motor hum
Mechanical idling sound
Motor hum is the low, steady sound produced by an electric motor running.
The sound comes from vibration in the motor's components and electrical frequency.
Motor hum often serves as ambient background noise—the refrigerator's hum, an air conditioner's drone.
The phrase can describe any similar continuous low-frequency sound: The motor hum of the city never stopped.
- buzzContinuous low drone
- droneUnmanned flying machine
- vibrationRapid oscillating movement
- whirContinuous humming sound
- purrFeline contentment sound
car engine · engine · idle · electrical · fan · ceiling fan · air conditioner · appliance · refrigerator · steady · low · resonance · mechanical · thrum · running · background · ambient noise · white noise
motor humsilence
Total lack of sound
stillness · quiet · dead silence · hush · soundlessness
motor humbirdsong
Avian musical vocalizations
cricket chirp · babbling brook · rustling leaves · forest sounds · ocean waves
motor, hum, motors, motored, motoring, motorist, motorists, motorize, motorized