Webster's English Dictionary

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grumble

grum.ble \'gr*m-b*l\ \-b(*-)lin\ \-b(*-)l*r\ \-b(*-)le-\ vb or grum.bling 
   [prob. fr. MF grommeler deriv. of MD grommen; akin to OHG grimm)X grim 1: 
   to mutter in discontent  2a: GROWL  2b: RUMBLE  : to express with grumbling 
    - grumble n