Etymology
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ripen (v.)

1560s, of fruits, seeds, etc., "grow ripe, come to maturity," from ripe (adj.) + -en (1). Figurative use by c. 1600. The transitive sense of "bring to maturity, make ripe" also is from 1560s. Related: Ripened; ripening. The earlier verb was simply ripe, Middle English ripen, from late Old English ripian, from the adjective.

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Definitions of ripen

ripen (v.)
cause to ripen or develop fully;
The sun ripens the fruit
Synonyms: mature
ripen (v.)
grow ripe;
The plums ripen in July
From wordnet.princeton.edu