grumble about 抱怨
constant grumbles 不断的抱怨
grumble under one's breath 喃喃自语地抱怨
A: Why is he always grumbling about the rules?
A：他为什么总是在抱怨这些规则？
B: I have no idea, he grumbles about everything!
B：我不知道，他什么都要抱怨！
1) 抱怨，咕哝
2) 怨言，不满的话
3) 发出隆隆声
1. 抱怨，咕哝
2. 怨言
verb
1. to complain in a low, unhappy, or angry voice
noun
1. a complaint or a low sound of dissatisfaction
Synonym: mutter, murmur