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1.
A safe area used during a game of Chasies / Tag in which a participant cannot be tagged. Also known as 'Den'.

Gatesies is thought to originate from early versions of the game played outside of school, were a defensive player would swing on a gate to remain safe from tagging.
Player 1: You're it

Player 2: You cannot tag me, sir, for I am in Gatsies.
by Busterson January 05, 2010