Definition of subsoil plough in US English:

subsoil plough

(US subsoil plow)

noun

  • A kind of plough with no mouldboard, used to loosen the soil at some depth below the surface without turning it up.

Origin

Early 19th century; earliest use found in American Farmer. From subsoil + plough.

Pronunciation

subsoil plough

/ˈsʌbsɔɪl ˌplaʊ/