tie-in

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tie-in

A piece of media, such as a book, movie, or video game, that uses or expands on the core material or content of something else as part of a marketing strategy or campaign. These video game tie-ins are usually pretty crappy, but this one's actually not bad. I'm writing a novel that acts as a tie-in to the film.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

tie-in

n. a connection; a liaison. I got a call from Mary—my tie-in with the mayor’s office—who says it’s all set.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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