This is the 10747th most frequent French word.
mûrir
To ripen or to mature.
In this sentence, 'mûrir' is used in the sense of becoming ripe or ready to eat, applied to fruits as its subject.
Les fruits mûrissent lentement au soleil.
The fruits ripen slowly in the sun.
'Mûrir' in this context expresses the idea of personal development and gaining maturity in making decisions.
Avec le temps, il a appris à mûrir dans ses décisions.
With time, he learned to mature in his decisions.
Here, 'mûrir' refers to the aging process applied to cheese in order to develop its flavor characteristics.