a hive of activity
A bustling or busy place. On Fridays, the school is only a hive of activity until 3:00 PM—then, everyone rushes out to start their weekend.
hive off
To separate someone or something from someone or something else. A noun or pronoun can be used between "hive" and "off." I think we need to hive this group off into another homeroom—there's just too many kids in here.
hive of activity
Fig. a location where things are very busy. The hotel lobby was a hive of activity each morning. During the holidays, the shopping center is a hive of activity.
hive off
v. To set something apart from a group: The CEO hived off the department into another division. The police academy hived the new recruits off during orientation.