Using the frame at which a character turns during a dash-dance, in which any normal ground options are available as if the character were standing still.

(Left) , (Right) or vice versa.

A pivot contains a few frames of dashing, followed by a single frame where your character is standing up straight. On this frame, you can use any move as if your character is standing still.
An example of a pivot Foward Smash
ARC dashdance baits a grab and punishes with a pivot tipper
from Forte 2
the difference between f-trhow wavedash f-smash and f-throw pivot tipper
from WHOBO MLG Edition
A collection of PewPewU pivot-tippers
from Apex 2015