What is defined as clipping in football?

Clipping in football specifically refers to a form of illegal blocking that occurs when a player makes initial contact with an opponent from behind, and that contact is at or below the waist. This rule is in place to protect players from dangerous hits, as such actions can lead to serious injuries. The rationale behind this prohibition is that blocking from behind can catch players off guard and can lead to them being struck without the ability to protect themselves.

The other options describe different types of actions or fouls that are not classified as clipping. Blocking from the side is legal as long as it is above the waist and not from behind. High hits above the neck are also illegal, but they fall under a different category of personal fouls aimed at player safety. Lastly, defensive fouling during a pass pertains to penalties related to interference or similar actions and does not relate to the definition of clipping. Therefore, the definition of clipping focused on the specific conditions of the block is essential for ensuring player safety and maintaining the integrity of the game.