couchsurfing
noun [ U ] uk/ˈkaʊtʃ ˌsɜː.fɪŋ/ us/ˈkaʊtʃ ˌsɝː.fɪŋ/
（旅游时通过网上广告住在陌生人家里的）沙发冲浪
the practice of travelling around and staying with people you do not know, who advertise their homes on the internet
Couch surfing is a great way to encourage connections across national borders. 沙发冲浪是跨境旅游的好办法。
做沙发客（因为没有自己的房子而借住在亲戚朋友家的沙发上）
staying with a series of different friends or relatives, sleeping, for example, on their sofa, because you do not have your own home
Synonym: sofa-surfing