[ I or T ] to (cause to) become ripe(使)成熟
The summer sunshine ripened the melons.在夏日阳光的照射下,瓜熟了。
These melons are ripening nicely.这些瓜马上就熟透了。
[ I ] to develop to a suitable condition for something to happen时机成熟;条件成熟
My plans are ripening - now all I need is official approval.我的计划就要瓜熟蒂落了——现在就差官方的批准了。