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Related to trout: Steelhead trout
You must lose a fly to catch a trout.
Prov. You have to sacrifice something in order to get what you want. (Implies that what you sacrifice is minor compared to what you will get.) Amy was willing to live cheaply for several years in order to save enough money to buy her own house. She knew that you must lose a fly to catch a trout.
old troutan unattractive or bad-tempered old woman. informal
1972 Victor Canning . The Rainbird Pattern She wasn't such a bad old trout. For all her money and position, life hadn't been all good to her.
trouser snakeand trouser trout
n. the penis. The doctor was taken aback when young Willard used the term “trouser snake.” Stop scratching your trouser trout in public.
See trouser snake
old troutChiefly British Offensive Slang
An elderly woman.