tie in

tie in (third-person singular simple present ties in, present participle tying in, simple past and past participle tied in)

1. (intransitive, idiomatic) To fit in or harmonize (with something).

   This paragraph does not tie in with the greater themes of the story.

   • 2019 March 8, Andrew Lupton, “JUNOS value to London? Try $12 million to start”, in CBC News‎^[1], archived from the original on 15 September 2021:

     "It works out perfectly for us," said Phoenix during an interview with CBC News that was at times interrupted by the sound of drills and saws. "It ties in nicely for our opening and it's just a good way to create a buzz with a new business."

2. (broadcasting) For a local station to begin broadcasting an ongoing network transmission.
   • 1938, United States. Congress. Senate. Committee on Interstate Commerce, Construction and Operation of a Radio-Broadcasting Station (page 105)

     I believe Argentina has a network of about 20 or 25 stations that they can tie in.

tie in (plural tie ins)

1. Alternative spelling of tie-in.

• “tie in”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.