Technical Definition-The game mechanic that allows for the release of a button to count as a separate input in place of pressing the button again. Called "Release Check" in NRS games and can be turned off.
In Other Words-"Two!"
"Uh, actually Homer that's just one. See each push up includes both an up part and a down part."
"D'oh!"-The Simpsons, Season 7 Episode 7