mole drain1
/ˈməʊl dreɪn/noun
A small subterranean drain made in agricultural land by a mole plough.
Origin
Early 19th century; earliest use found in Arthur Young (1741–1820), agricultural reformer and writer. From mole + drain.
mole-drain2
/ˈməʊldreɪn/verb
[with object] To drain (land) using a mole plough.
Origin
Mid 19th century; earliest use found in Henry Stephens (1795–1874), writer on agriculture. From mole + drain.