The user knocks the opponent down hard with a mighty swing of its arm, startling it out of any attacks it might have been preparing.
The user runs at the opponent and swings an arm at it, knocking it flat and disrupting its attempt to charge or continue an attack.
If the target is charging a move with the Has charge turn flag or is in the middle of a multi-turn move (e.g. Outrage or Rollout), that move is immediately canceled and will do no damage/have no effect if it was to strike/activate on this turn. This move still cannot hit Pokémon during the semi-invulnerable turn of moves like Dive or Fly unless the user has No Guard or the target is under the effect of Lock-On or Mind Reader.