换新

to replace with sth new / to upgrade

to exchange / to change (clothes etc) / to substitute / to switch / to convert (currency)

abbr. for Xinjiang 新疆[Xin1 jiang1] or Singapore 新加坡[Xin1 jia1 po1] / surname Xin

new / newly / meso- (chemistry)

out with the old and in with the new (idiom)