constantthrob
nounUK /ˈkɒnstənt θrɒb/
US /ˈkɑːnstənt θrɑːb/
A steady beat that never stops.
The constantthrob of the drum helped the dancers keep time.
OTHER MEANINGS
2. A dull pain that keeps going without a break.
He felt a constantthrob in his ankle after the long hike.
3. The unending hum of a machine or engine.
The constantthrob of the old refrigerator kept her awake.
4. A steady, repeating sound in music.
The song's constantthrob came from a low bass line.