A tag-out is a support move where a player from the backline tags on the shoulder (or waves off) one or more players in a scene, ending that scene.
Those who have been tagged are to return to the backline but those who were not tagged remain on stage, as the same characters, in a new situation.
Players who perform the tag-out are new characters.
A tag run or tag out run is a series of tag-outs performed in succession.
"I really like watching exploratory tags (where we kind of expand the world) because I feel like those can still surprise me, but I feel like most tag runs that just hit a game repeatedly get boring and really quick. I have also seen good ones of course, but is there something that separates successful from unsuccessful tag runs? What makes them work and lets you stay ahead of the audience."
- –Stephen Perlstein, Improv Obsession