By-catch definitions

bī'kăch', -kĕch'
The portion of a fishing catch that is discarded as unwanted or commercially unusable.
noun
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Any fish (other creatures) that are not targeted as a catch but are unintentionally caught, and often discarded back into the sea.
noun
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To catch unintentionally while fishing for something else.
verb
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Alternative spelling of bycatch.
noun
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Origin of by-catch

From by- +‎ catch.