[football] term, by where a player (usually of lesser ability) will attempt to tackle an opposition player (usually of superior abiliy) in a grossly unfair and extremely violent manner, so as to let the opposition player know that if he values his [family jewels] then today might be a good day to have an off day.
The reducer is often aimed at knee height of the opposition player (or in extreme cases, the [testicles]), and will usually take place in the first few minutes of the game.
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