Definition of tie–in
1 : something that ties in, relates, or connects especially in a promotional campaign
2 : a book that inspired or was inspired by a motion picture or television program
First Known Use of tie–in
TIE–IN Defined for English Language Learners
Definition of tie–in for English Language Learners
: a product (such as a toy) that is connected with a movie, television show, etc.
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