grumble
verb [ I ] uk/ˈɡrʌm.bəl/ us/ˈɡrʌm.bəl/
发牢骚，抱怨，嘟囔
to complain about someone or something in an annoyed way
She spent the evening grumbling to me about her job. 她一晚上都在向我抱怨她的工作。
[ + speech ] "You never hang your coat up," she grumbled. “你就从来不会把外套挂起来。”她埋怨道。
（通常因为饿而）肚子咕咕叫
If your stomach grumbles, it makes a low, continuous noise, usually because you are hungry.
grumbler
noun [ C ] uk/ˈɡrʌm.blər/ us/ˈɡrʌm.blɚ/
牢骚满腹的人，总是抱怨的人
a person who complains a lot
Idiom
mustn't grumbleidiom UK humorous 没有什么好抱怨的，日子过得还不错
something you say to mean that your life is not bad and that you should not complain about it
"How's it going then, Mike?" "Oh, not too bad. Mustn't grumble." “那么，一切还好吧，迈克？”“哦，挺好，没有什么好抱怨的。”
grumble
noun [ C usually plural ] uk/ˈɡrʌm.bəl/ us/ˈɡrʌm.bəl/
（同 complaint）
a complaint
When the teacher assigned extra homework, she heard a few grumbles from the kids. 要是再让我听到你抱怨饭不好吃，你就自己做！