Noun:
1: tag a label made of cardboard or plastic or metal
2: tatter, tag end, tag, rag, shred a small piece of cloth or paper
3: tag a game in which one child chases the others; the one who is caught becomes the next chaser
4: tag (sports) the act of touching a player in a game (which changes their status in the game)
Verb:
1: tag, label, mark attach a tag or label to; "label these bottles"
2: tag touch a player while he is holding the ball
3: tag provide with a name or nickname
4: chase after, trail, go after, give chase, chase, dog, track, tag, tail go after with the intent to catch; "The policeman chased the mugger down the alley"; "the dog chased the rabbit"
5: tag supply (blank verse or prose) with rhymes