fifty-fifty

(sports) A challenge between two opposing players, where both have an equal chance of taking possession.

(skateboarding) Ellipsis of fifty-fifty grind.; a rail or edge grind, using both trucks to grind along, longitudinally aligned.

(snowboarding) Ellipsis of fifty-fifty slide.; a rail slide where the snowboard is longitudinally aligned with the direction of the slide, down the centerline.