They traded down to a smaller house after their children had grown up and moved away.孩子们长大搬出家之后，他们换了一套小点的房子。Our shop trades down during the slow season.我们店在淡季做低档货生意。People will trade down to own labels which are cheaper.人们会改为购买价格更低的自有品牌。The stores traded down during the slow season.这几家商店在淡季做低档货生意。