tie in
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.
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Source: A Dictionary of American Idioms
