fructifyverb
/ˈfrʌk.tɪ.faɪ//ˈfrʌk.tɪ.faɪ/formal[ I ] to produce a good or useful result:
I let the idea sit in the back of my mind to fructify.
[ T ] to make something fertile or make it produce a good result:
They believed their sacrifice would fructify the soil.