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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.
In other contexts, it is the noun form of the verb ukeru, which means, to catch, to receive, to be on the reveiving end. So, the catch (i.e., in baseball), the receiver (i.e., in a sexual context). In the context of a relationship it refers to the one who is in the more passive or receiving side of the relationship.