Fine, dry particles of matter. A cloud of fine, dry particles. Particles of matter regarded as the result of disintegration: fabric that had fallen to dust over the centuries. Earth, especially when regarded as the substance of the grave:"ashes to ashes, dust to dust"(Book of Common Prayer). The surface of the ground. A debased or despised condition. Something of no worth. Chiefly British Rubbish readied for disposal. Confusion; agitation; commotion: won't go back in until the dust settles. To remove dust from by wiping, brushing, or beating: dust the furniture. To sprinkle with a powdery substance: dusted the cookies with sugar; dust crops with fertilizer. To apply or strew in fine particles: dusted talcum powder on my feet. Baseball To deliver a pitch so close to (the batter) as to make the batter back away. To clean by removing dust. To cover itself with dry soil or other particulate matter. Used of a bird.