top dressing(redirected from top dressings)
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a thin layer of loose gravel that covers the top of a road surface
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A layer, usually thin, of manure, humus, loam, etc., to improve soil conditions in planted areas.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.