verb (~d; grumbling) Etymology: probably from Middle French grommeler, ultimately from Middle Dutch grommen; akin to Old High German grimm grim Date: 1580 intransitive verb to mutter in discontent, growl , rumble , transitive verb to express with grumbling, ~ noun ~r noun grumblingly adverb grumbly adjective
GRUMBLE
Meaning of GRUMBLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012