Reverse is an attack effect in the Super Smash Bros. series that debuted in Super Smash Bros. Melee and has appeared in every subsequent game. A fighter hit by a reverse attack is forcibly turned around to face the opposite direction instead of flinching.
A fighter flipped by a reverse attack turns away from the screen and assumes a mirrored stance, showing their back side, the reverse effect being the only way to see this pose.
While hitboxes with the reverse effect generally do not cause knockback, there are situations where they can boost the momentum of an airborne character. Reverse attacks typically also reflect projectiles, but this is solely a design convention and is not a property of the reverse effect.
In Super Smash Bros. Ultimate, due to Ryu and Ken always facing their opponent in 2-player battles, if one of them is flipped by a reverse attack in a 2-player battle, they immediately turn back to face their opponent again.
List of reverse attacks