Definition of "Tag" :
noun: (sports) the act of touching a player in a game (which changes their status in the game)
noun: a game in which one child chases the others; the one who is caught becomes the next chaser
noun: a small piece of cloth or paper
noun: a label written or printed on paper, cardboard, or plastic that is attached to something to indicate its owner, nature, price, etc.
noun: a label associated with something for the purpose of identification
"Semantic tags were attached in order to identify different meanings of the word."
verb: provide with a name or nickname
verb: attach a tag or label to
verb: touch a player while he is holding the ball
verb: supply (blank verse or prose) with rhymes
verb: go after with the intent to catch