There are two sentences below,
- He stored the goods in the store.
- He stored up the goods in the store.
What is the difference between the two sentences? What is the function of the preposition 'up' here? Please, tell me.
up there conveys the idea of "accumulation".
The squirrel accumulated acorns for the winter.
The squirrel stored up acorns for the winter.
Without up there is no sense of accumulation:
The leopard stored its kill in a tree.