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subsoil
subsoil /ˈsʌbˌsɔɪl/
noun
-
(
)
The layer of soil between the topsoil and bedrock
(
undersoil
, subsoil
)
the layer of soil between the topsoil and bedrock
I dug down to the subsoil layer to improve drainage in my garden beds
I dug down to the subsoil layer to improve drainage in my garden beds
