释义
v.
complain or protest about something in a bad-tempered but typically muted way
（尤指小声地）表示不满，抱怨，发牢骚；咕哝，嘟囔
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[with clause]
his father was grumbling that he hadn't heard a word from him 他父亲抱怨说没有收到他的一点儿音讯
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[with obj.]
he grumbled something about the decision being unnecessary .他咕哝着说了些认为决定是多余的之类的话。
[no obj.]make a low rumbling sound
发低沉的轰隆声
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thunder was grumbling somewhere in the distance .远处雷声隆隆。
[no obj.](of an internal organ)give intermittent discomfort
（内脏）间歇性地闹病
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[as adj.
grumbling ]a grumbling appendix .时断时续地疼痛的阑尾。
n.
a complaint
抱怨，牢骚
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the main grumble is that he spends too much time away .主要的不满是他不在家的时间太多。
a low rumbling sound
低沉的轰隆声。
词源
"late 16th cent.: from obsolete