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What does "grumble" mean?

Grumble means to complain or murmur in a low, indistinct voice. It can also refer to a low, rumbling sound, like the growling of thunder.

Example sentences:

* She was grumbling about the long wait in line.
* The car's engine was grumbling as it struggled to start.
* The storm clouds were grumbling in the distance.

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