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in
noun (in children's games) being the player called upon to perform some task, as in tag the one who must catch the other players. Compare it, he, up.
Contributor's comments: The term 'in' as per NSW~Qld usage, was known to me as a school girl ('60's) in Melbourne govt schools.
Contributor's comments: When I played hide and go seek in S.E. Qld I was in not up.
Contributor's comments: As I grew up around the Lake Macquarie and Lower Hunter area, "in" was the active participant in almost any sport or game. "Who's in?" "Brian's in."