reel (one) back in

Alludes to the literal act of winding in a line to pull something, such as a fish, closer to oneself.

1. To cause one, usually a former romantic partner, to resume dating oneself. How am I supposed to reel Amanda back in now that I've lost my job and am completely broke? Want to get back together with your ex? In this month's issue, we've got 10 tried-and-true tips to reel him back in!

2. To help or encourage one to return to the crux of something. David kept going totally off topic in the board meeting, no matter how much we tried to reel him back in.