From Longman Dictionary of Contemporary Englishtie-inˈtie-in noun [countable] BBTa product such as a record, book, or toy that is related to a new film, TV show etc
Examples from the Corpus
tie-in• I thought that could be a tie-in with the traditions of Halloween.• It is not a tie-in but a new story full of action, wit and unsavoury characters.• The selling of book tie-ins in video outlets can not be far behind.• I have mentioned only a few established C format titles, no reprints of television or film tie-ins, and no annuals.• The inevitable tie-ins are going to be gross.• The possibilities for other Oprah tie-ins that could be sold alongside cups of java are limitless.• A quick mention of a television tie-in.• There are some unsavoury tie-ins at work here.From Longman Business Dictionarytie-inˈtie-in noun [countable]MARKETING1a product such as a record, book, or toy that is connected with a new film, TV show etcMany of the books in the bestseller lists are TV tie-ins.2a way of PROMOTING (=attracting people’s attention to) a new film, TV show etc by connecting it with something such as a free gift or well-known productThe movie has no marketing tie-ins with fast-food restaurants. 