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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.
See also: catch, fly, lose, must, trout

old trout

an 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.
See also: old, trout

trouser snake

and 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 also: snake, trouser

trouser trout

See also: trouser, trout

old trout

Chiefly British Offensive Slang
An elderly woman.
See also: old, trout