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grum‧bling

1 [uncountable] also grumblings [plural] a complaint about something :
She paid up, with some grumbling.
Soon, the grumblings turned to open discontent.
She paid up, with some grumbling.
Soon, the grumblings turned to open discontent.2 [uncountable] a low continuous sound :
the grumbling of distant thunder
the grumbling of distant thunder