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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 noun [U]. âº the âactivity of âtrying to do as well as a competitor or of âtrying to âreach a âlevel of âachievement: Having âstarted his fund-raising late, he had to âplay catch-up if he âwanted to get enough âmoney for his âpolitical âcampaign. the âprocess of âtrying to âreach the same âstandard or âquality as someone or something else when they have become more âadvanced or âsuccessful: I'm playing catch-up because of the weeks of âtraining I have missed. (Definition of catch up from the Cambridge Business English Dictionary Â© Cambridge University Press).