Английский словарь американских идиом - tie in

{v.} To connect with something else; make a connection for. - Often used with "with". * /The teacher tied in what she said with last week's lesson./ * /The English teacher sometimes gives compositions that tie in with things we are studying in other classes./ * /The detectives tied in the fingerprints on the man's gun with those found on the safe, so they knew that he was the thief./