stock up (on something)

To "stock up" means to buy a lot of something, so that you'll have it ready.

Use "on" to express what you're buying a lot of:

Make sure to stock up on food and water before the storm hits.

Cigarettes are cheap over here, so a lot of people who visit stock up on them.

People usually stock up on consumable goods, like food, drinks, batteries, paper towels, etc.

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