Be It' is a phrase used in many games, most notably the game of tag. It is used to indicate that the person who says it is 'it' and must chase the other players. The phrase is also used in other games such as hide-and-SEEK, where it is used to indicate that the person who says it is the one who will SEEK out the other players. In some cases, the phrase can also be used to indicate that the person who says it is the leader of the game.