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To exchange something smaller or less expensive for something larger or more expensive. We just had our second child, so we are trading up to a larger car. After the promotion, Janet decided to trade up to a bigger house.
trade up (to something)
to exchange a lower-level product for a specific higher-level product. I would like to trade up to a more luxurious model. I would like to trade up.
see under trade down.
To trade something for something else of greater value or price: The value of our house soared, which allowed us to trade up to a larger place.