double up
US /ˈdʌb.əl ʌp/
UK /ˈdʌb.əl ʌp/

1.
合住, 共用
to share a room or bed, especially when there is not enough space for everyone to have their own
:
•
We had to double up in a small hotel room during our trip.
旅行期間,我們不得不在一間小旅館房間裡擠在一起。
•
Due to limited space, some students will have to double up in the dorms.
由於空間有限,一些學生將不得不在宿舍裡合住。