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to grumble
01
to complain quietly or softly, often in a way that others cannot hear or understand
02
to emit a low, continuous sound
03
to express dissatisfaction or annoyance about something to someone else
Example
He was grumbling under his breath during the meeting.
They grumbled softly as they waited for their food.
He often grumbles when things do not go his way.
She is grumbling because her favorite show is canceled.
She grumbled under her breath when she missed the bus.
