Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Gardening, Soiltopdressingtop‧dress‧ing /ˌtɒpˈdresɪŋ $ ˈtɑːpˌdresɪŋ/ noun [countable, uncountable] technical DLGTASa layer of fertilizer that is spread over land so that it will produce better crops ldoceonline.com