In pairs
Definition 1 of 1
Pro Tip 1/3Collaborative Activity
Use 'in pairs' to suggest working closely with another person on an activity or task. 
Teachers often instruct students to discuss a topic in pairs.
Pro Tip 2/3Mutual Support
'In pairs' implies that both individuals offer mutual support or participation in an activity. 
We had to solve the puzzle in pairs, helping each other out.
Pro Tip 3/3Pair Formation
Suggests formation of twos for efficiency or organization, not necessarily intimacy. 
The tourists were advised to move in pairs through the museum.