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stock up (with something)
to build up a supply of something. You had better stock up with firewood before the first snowstorm. Yes, I will stock up today.
1. To provide or furnish something with supplies: The bartender stocked up the bar with vodka. We stocked the house up with emergency supplies.
2. stock up on To gather and store a supply of something: We stocked up on canned goods before the storm came.