trout  
noun uk/traʊt/ us/traʊt/
  (FISH)         
  [ C or U ] plural trout or trouts鳟鱼 
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。 
  [ U ]鳟鱼肉 
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。 
   (PERSON)      
 [ C ] UK informal plural trouts老家伙;(尤指)讨厌的婆娘,恶婆子 
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。