兼用

この部屋は寝室と書斎の兼用です。

This room serves as both a bedroom and a study.

晴雨兼用の傘を一本持っておくと便利だ。

It's handy to have an umbrella that works for both sun and rain.

狭いアパートなので、食卓を机と兼用している。

Since the apartment is small, I use the dining table as my desk too.