win back

verb3

1. •
   To win (something) that one has previously lost.

   • He lost $1000 in one hand, and spent most of the night trying to win it back.
2. •
   To regain favour (with).
3. •
   To get (someone) to be one's partner, after having been apart.

   • John, my ex-boyfriend, said he wanted to see me again, so I told him how much I wanted him in an effort to win him back.