dethatch

de- +‎ thatch

dethatch (third-person singular simple present dethatches, present participle dethatching, simple past and past participle dethatched)

1. (transitive) To abrade the surface of a lawn or turf in order to remove dead grass.
   • 2008 June 12, Jay Romano, “Grass, Simplified: Hire Someone”, in New York Times‎:

     The services available vary widely, from basic tasks like mowing and edging walkways and flower beds to more involved work like trimming shrubs and bushes, applying fertilizer and pesticides, and dethatching, which removes layers of dead grass.

• thatched