flatshare       
 noun [ C ] UK (also flat share, flat-share) uk/ˈflæt.ʃeər/ us/ˈflæt.ʃer/
 公寓合租
an arrangement in which two or more people live in the same flat or apartment and share the cost
  They lived in a flatshare together. 他们一起合租在一套公寓里。 
 She entered into a flatshare with her workmate. 她跟同事合租了一套公寓。 
 - More examples
 - A flatshare can be a depressing option if you're in your thirties.
 - We all have to live in flatshares because buying or renting our own place is out of the question.
 - We ended up in the same flatshare and then we started going out.
 - There are some good flatshare websites for finding places to live.
 
flatshare       
verb [ I ] UK (also flat share, flat-share) uk/ˈflæt.ʃeər/ us/ˈflæt.ʃer/
 合租公寓
to live in the same flat or apartment with someone and share the cost
  I'm living with my parents at the moment but I hope to flatshare. 我现在和父母住在一起,但我希望搬出去跟人合租一套公寓。 
 She flatshares with some friends from college. 她和大学里的几个朋友一起合租公寓。 
 - More examples
 - We couldn't afford our own place so we had to flatshare.
 - a pair of flatsharing bachelors