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Definitions for by-catch. Here are all the possible meanings and translations of the word by-catch. Princeton's WordNet(0.00 / 0 votes)Rate this definition: by-catch, bycatch(noun) unwanted marine creatures that are caught in the nets while fishing for another species. thousands of dolphins and porpoises and whales are killed as part of the by-catch each year.
a phrase that attracts or is meant to attract attention. 2. a phrase, as a slogan, that comes to be widely and repeatedly used, often with little of the original meaning remaining. Origin of catch phrase. 1840-1850. First recorded in 1840-50; catch(word) + phrase. Examples from the Web for catch phrase.