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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.
to replace something with something better or more valuable When Phil needed a new car, he decided to trade up and bought a luxury car.
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.