rumbling

rumblings of discontent among the medical establishment.

the rumbling of wheels in the distance.

there are growing rumblings of discontent.

a lot of rumbling about

the rumbling vibrations set the whole valley quaking.

a low rumbling sound that began to vibrate through the car.

I've heard rumblings that Tom may leave.

a rumbling dispute about changes to working conditions.

ominous black clouds; ominous rumblings of discontent.

he was still rumbling discontentedly when Pike returned bearing a folder of foolscap sheets.