rumbling

noun
1
a long deep sound or series of sounds
غرش, صدای بم, صدای بلند و عمیق, صدای غلتیدن
2
things that people are saying that may not be true
شایعات, زمزمه‌ها, شایعات پراکنده
There are rumblings that the election may have to be postponed.
synonym rumour