Down tilt, Smashpedia

A Strong Down, also known as a Down tilt (abbreviated "d-tilt,") is a Strong Attack performed by any character by holding the control stick lightly down or crouching and pressing A while on the ground. It will instantly hit all surrounding characters, making it useful for spacing. It is also useful for a foe rolling around you. It can also be performed by pressing Z while crouching. In Super Smash Bros. Brawl, many Strong Down attacks have the ability to make opponents Prat Fall/trip occasionall

Up tilt, Smashpedia

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Down tilt - SmashWiki, the Super Smash Bros. wiki

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