D0172000 (dē-thăch′)v.de·thatched, de·thatch·ing, de·thatch·esv.tr. To remove (dead grass) from a lawn, usually to aerate the soil.v.intr. To remove dead grass from a lawn.de·thatch′er n.
dethatch
(diːˈθætʃ) vb (tr) to remove dead grass from (a lawn)