To stash something means to hide it in a secret place for later.
Stashing something can make people think of secrets, surprises, or hiding things.
Examples:
I will stash my candy under my bed.
She stashes her toys in the closet.
He stashes his treasure in a box.
I will stash my vegetables in my brother's room!
She stashes her toys in a secret cave in the garden.
He stashes his candy in his shoe so no one can find it.