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Related to buy up: Buy and Sell
buy something up
to buy all of something; to buy the entire supply of something. He bought the oranges up from all the groves. He bought up all the oranges and drove up the price.
Purchase all that is available, as in They want to buy up all the land in this area. This term was first recorded in a law enacted under Henry VIII: "They buy up all manner of fish."
1. To purchase something entirely or completely: The real estate agent bought up all the land in the area. I wanted to get one of those T-shirts, but someone has already bought them up.
2. To quickly purchase as much of something as possible, especially when supplies are limited: People are buying up food supplies in case the blizzard hits. I bought all the donuts up at the bakery and took them to work.