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When one player in a competitive game decides to help another player win, without providing any benefits to the player conducting the cahill'ing.

Often done in order to seek revenge against other players or be a tool.
Oh damn, Cam was totally going to win that game of Catan last night - until Chris decided to start cahill'ing the fuck out of him with stupid trades.
by ZacharyJay May 18, 2018
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