1 remarks that show that people are starting to become annoyed, or that a difficult situation is developing :
rumblings of discontent
There have been rumblings about the need for better computers.
rumblings
[plural]
rumblings of discontent
There have been rumblings about the need for better computers.2 [countable usually singular]CS a series of long low sounds :
We heard a rumbling behind us.
We heard a rumbling behind us.
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