IPA: /ˈtɒpˌsɔɪlɪŋ/
KK: /tɑpˈsɔɪlɪŋ/
The process of removing the upper layer of soil from a piece of land, usually before starting construction or landscaping work.
Topsoiling is an important step in preparing the land for building projects.
Topsoiling → It is formed from "top" (from Old English *top*, meaning the highest part) and "soiling" (from the verb "soil", meaning to make or cover with soil). The word refers to the act of covering or enriching the uppermost layer of soil.
Think of the 'top' layer of soil being enriched or covered — that's what topsoiling means.