pair off／up
join or cause sb． to join sb． else to make a pair or couple（使）成对
The teacher told the children to pair off．老师让孩子们分成两人小组。
John paired up with Mary to play tennis．约翰和玛丽配对在网球中打双打。
The two eventually paired off after having been friends for several years．他们俩交了几年朋友后终于结婚了。
This shoe does not seem to pair up with that．这只鞋似乎跟那一只不成对。