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Example
The old car engine would grumble loudly before finally starting up on cold mornings.
The old water pipes in the house would often grumble ominously in the night.
After a long day of hiking, their stomachs started to grumble audibly.
The distant thunder began to grumble as the storm approached.
As the wind picked up, the shutters on the old house began to grumble against the frame.
