[, ]a method of buying sth by giving a used item as part of the payment for a new one; the used item itself折旧换购；以旧换新；折价旧物◆The company accepts trade-ins on desktop computers.在这家公司可折旧换购台式计算机。◆the trade-in value of the old car旧汽车的以旧换新抵价SYNpart exchange () ▸ˈtrade-in