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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.
catch-up adjective [before noun]. âº used to âdescribe something that âhelps you âreach the same âstandard or âstage as âothers, usually after you have âmissed something such as âlessons or âopportunities to âpractise: catch-up âexercises/âsessions. [I or T] to âreach the same âlevel or âquality as someone or something else: catch up with sth It was âyears before âdemand for âoffice âspace âcaught up with âsupply.catch sb up Their newer âcompetitors are threatening to âcatch them up.