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Slang Definition:
Sideboxes
is a term used to describe a box in which players play multiple games at once. It's often seen in tabletop role-playing games like Dungeons & Dragons (D&D) or Magic the Gathering (MTG), where it can refer to a group of players who are playing together.
Example Sentence: "Sideboxes were so exciting, I was feeling the same way about them."