grum·bling /ˈɡrʌmblɪŋ/ noun 1 [uncountableU] (also grumblings [plural]) a complaint about something 抱怨，牢骚，嘟哝 She paid up, with some grumbling. 她很不情愿地嘟哝着付了钱。
Soon, the grumblings turned to open discontent. 不久，这些牢骚就成了公开的不满。
2 [uncountableU] a low continuous sound 隆隆声 the grumbling of distant thunder 远处隆隆的雷声
grumbling• To their creaking and grumbling was added a new note, comparable to music.• In many cases, however, it is expressed as an intermittent grumbling of practitioners rather than as a systematic counter-argument.• A muted grumbling followed, then the slamming of a door.