a fish that lives in rivers and lakes, or lives in the sea but returns to rivers to produce its eggs, that is a popular food

Thousands of young salmon and trout have been killed by pollution. 成千上万条鲑鱼和鳟鱼的幼鱼因污染而死亡。

The lake is famous for its trout fishing. 这座湖以捕鲑鱼闻名。

the flesh of this fish eaten as food

I had some perfectly cooked trout. 我吃的是一份做得极好的鳟鱼。

an old person, especially a woman, who is unpleasant or not attractive

She's a miserable old trout who complains about everything. 她是个令人讨厌、牢骚满腹的老太婆。