to match or agree with sth; to link sth or be linked to sth; to happen, or arrange for sth to happen, at the same time as sth else
tie in (with sth)
to match or agree with sth
This evidence ties in closely with what we already know.
tie in (with sth)
to link sth or be linked to sth; to happen, or arrange for sth to happen, at the same time as sth else
The concert will tie in with the festival of dance taking place the same weekend.
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición