tie in with something phrasal verb ( see also ↑ tie )
1 . to be similar to another idea, statement etc, so that they seem to be true SYN match :
Her description tied in with that of the other witness.
2 . ( also be tied in with something ) to be related in some way to something else:
How does all this tie in with their long-term aims?
3 . to happen at the same time as something else:
The book was published to tie in with the TV series.