tag-team

Short definition from Wiktionary

Adjective

1. 1
   Performed by two or more people or groups working alternately.

Verb

1. 1
   To wrestle as part of a tag team (sense 1).
2. 2
   To alternate working with someone else in order to accomplish a task.
3. 3
   To alternate working with someone else in order to accomplish a task directed at (someone).
4. 4
   To have sex with (someone) in a group with one or more other people.
5. 5
   Alternative form of tag-team.

Noun

1. 1
   A group of wrestlers who work together as a team. Only one is in the ring at any given time, and they change places by "tagging" each other with a gesture like a high five.
2. 2
   Two or more people acting alternately to accomplish some task.
3. 3
   An act of two or more people having sex with one person who is the focus of the sexual activity; a gangbang (sense 1); also, the people having sex with the person who is the focus of the sexual activity regarded as a group.