IPA: /ˈsʌbˌsɔɪl/
KK: /sʌbˌsɔɪl/
The layer of earth that is located below the top layer of soil, often containing minerals and nutrients.
Farmers often test the subsoil to understand the health of their crops.
To turn over or break up the layer of soil that is below the topsoil, often to improve its condition for planting.
Farmers often subsoil their fields to enhance crop growth.
Past: subsoiled
Past Participle: subsoiled
Subsoil → It is formed from "sub-" (meaning under) and "soil" (from Old French *soil*, meaning ground or earth). The word "subsoil" refers to the layer of soil that lies beneath the topsoil.
Think of something that is 'under' ('sub-') the ground or earth ('soil') — that's what subsoil means.
No commonly confused words.