grouch [graʊtʃ]

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n.牢骚，不满；v.抱怨

to complain in an angry way

He's always having a grouch about something. 他总是发脾气抱怨这个抱怨那个。
One of the biggest grouches is the new system of payment. 人们抱怨最多的一点就是这种新的支付方式。