[grum.ble] vb grum.bled ; grum.bling [prob. fr. MF grommeler, ultim. fr. MD grommen; akin to OHG grimm grim] vi (ca. 1586) 1: to mutter in discontent
2: growl, rumble ~ vt: to express with grumbling -- grumble n -- grum.bler n -- grum.bling.ly adv -- grum.bly adj