The act of sitting someone on a bench, especially removing a sports player from active play; benches collectively, or the material for making benches.
From 'bench' plus the '-ing' suffix. In sports, it developed the meaning of removing a player from play; in manufacturing, it refers to bench seating collectively.
In modern sports culture, 'benching' (removing a player) is so common that people use the term for relationships—'he benched me' means he's sidelined you, showing how language evolves from sports!
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