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Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs