croak [krəʊk]

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vi.嘎嘎叫，发牢骚

When animals such as frogs and crows croak, they call making deep rough sounds .

Everyone seemed rather out of sorts and inclined to croak. 每个人似乎都有点不对劲，想发发牢骚。
Frogs began to croak with the rainfall. 蛙随着雨落开始哇哇叫。