Reducer

[Sarah]

[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.

[Dianne]

When you make a massive [slide tackle] in [a game of football] and the other player is brought to the [floor],

[Mary Mallozziberg]

in football, a hard tackle that a defender makes at the beginning of a game, with the intention of making an attacking player feel worried for the rest of the game