trade something in
phrasal verb with trade verb uk/treɪd/ us/treɪd/
以…折价换购（尤指同类的新品）
to give something you own as part of your payment for something you buy, especially a new type of the same thing
He recently traded in his Jeep for a red Mercedes. 他最近用自己的吉普车折价换购了一辆红色的奔驰轿车。