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ripen
ripen up
To grow ripe; to become mature enough to harvest or pick. Make sure you plant your tomatoes in a spot that gets plenty of sunshine, or else it will take a whole lot longer for them to ripen up.
ripen into something
1. Lit. to ripen and become something recognizable. This little green ball will ripen into an apple.
2. Fig. to mature into something. This problem is going to ripen into a real crisis if we don't do something about it right now. The small matter ripened into a large problem in a short time.