3. To follow closely after; esp., to follow and touch in the game of
tag. See Tag, a play.
Tag, v. i. To follow closely, as it were an appendage; — often with
after; as, to tag after a person.
Tag, n. [From Tag, v.; cf. Tag, an end.] A child's play in which one
runs after and touches another, and then runs away to avoid being
touched.