Underdrain
noun
1.
a drain placed beneath the surface of cultivated fields, streets, etc.
verb (used with object)
2.
to equip or supply with an underdrain or underdrains.
noun (ˈʌndəˌdreɪn)
1.
a drain buried below agricultural land
verb (ˌʌndəˈdreɪn)
2.
to bury such drains below (agricultural land)
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