trade up
phrasal verbtrade up
- to sell something in order to buy something more expensive
卖次买好；（卖掉原有的以便）买更贵的东西 - We're going to trade up to a larger house.
我们打算卖掉房子，再买一座大点的。
- We're going to trade up to a larger house.
- to give something you have used as part of the payment for something more expensive
以旧物折价添钱买较贵的东西；折价贴换