ripen

verb4

1. •
   Of grain, fruit, flowers, etc., to grow ripe; to become mature.

   • Grapes ripen in the sun.
2. •
   To approach or come to perfection.

   • The acquaintance soon ripened into a warm attachment. — 1861
3. •
   To cause (something) to mature; to make ripe.

   • The warm sun ripened the corn.
4. •
   To mature; to fit or prepare; to bring to perfection.

   • When Faith and Love which parted from thee never Had ripen'd thy just soul to dwell with God — 1673