Two Bowser sidestepping, on Green Hill Zone.

Sidestepping (also known as "sidestep dodging", "spot dodging", "ground dodging" or simply "dodging") is a mechanic in the Super Smash Bros. games and in Super Smash Flash 2 that renders the character invincible for a small amount of split-seconds. Functionally similar to an air dodge, it is performed by pressing down while shielding, and can be employed to evade any and all harm of short duration. It is perhaps most useful in dodging projectiles and items along with quickly counter-attacking foes during the ending lag of their missed attack.