grow on

verb2

1. •
   To become more likeable to someone.

   • I didn't like this song at first, but now it's starting to grow on me.
2. •
   To gradually become more evident to someone.

   • "I can tell you now, Sam. […] When you left me last night, the whole deadly seriousness of the matter grew on me, till I was as miserable as a man can be." His face lightened as I spoke. — 1902