to remember things so you can share them later
I've been listening to their conversations and storing it all up for future use.
私は彼らの会話を聞いていて、将来のためにすべてを蓄えている。
to keep something for later use instead of using it now
She decided to store up some food for the winter.
彼女は冬に備えて食料を蓄えることに決めた。