grumble

n. 怨言、滿腹牢騷

vi. 抱怨、發牢騷、發隆隆聲

vt. 抱怨

英文釋義

1. a loud low dull continuous noise
2. a complaint uttered in a low and indistinct tone
3. show one's unhappiness or critical attitude
4. make complaining remarks or noises under one's breath