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v. de·thatched, de·thatch·ing, de·thatch·es
To remove (dead grass) from a lawn, usually to aerate the soil.
To remove dead grass from a lawn.

de·thatch′er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


vb (tr)
to remove dead grass from (a lawn)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Other products include the Z-Plug stand-on aerator that is designed to convert to a slicer/seeder, snow plow or dethatching rake, and the stand-on Snowrator for snow and ice management.
Add to all of that the dethatching capabilities of sheep feet and you might wonder why folks choose mechanical mowing machines at all.
Dethatching is hard work, so it's smart to prevent buildup in the first place.
Weekends, especially, offer blocks of time in which to accomplish tasks such as aeration or dethatching and, of course, mowing.
They experimented with various ratios of water and fertilizer, aerated the patch, and debated the pros and cons of dethatching. One evening they drove to the hardware store, where Eddie purchased outrageously priced, though ineffectual, time-release nutrient pellets.
There are implements specifically made for dethatching only, but a tine harrow is many implements in one.
Robert learned the proper procedure for aerating and dethatching turf.
The frequency of dethatching operations is determined by the rate of thatch accumulation.
Much has been said concerning the value of dethatching lawns.
If power-raking (dethatching) is planned, do it as part of lawn preparation.
The data also suggest that establishment of Tifdwarf bermudagrass from sprigs, and recovery from disruptive cultivation practices such as core aerification and dethatching, may be slower during periods of high temperature (>30[degrees]C) and light (>1000 [micro]mol [m.sup.-2] [s.sup.-1]) characteristic of late-June through early September in the southern USA.