Dual-purpose / for combined use — usable for two or more purposes; serving two functions at once.
このテーブルは食事と仕事の兼用で使っている。
We use this table for both eating and working.
男女兼用のトイレが駅に設置された。
A unisex restroom was installed at the station.
そのバッグは通勤と旅行兼用で便利だ。
That bag is convenient for both commuting and traveling.
電子レンジとオーブン兼用の調理器具を買った。
I bought a cooking appliance that can be used as both a microwave and an oven.