Etymology
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earthwork (n.)

"mounds of earth thrown up for some purpose, especially as a military fortification," 1630s, from earth + work (n.). In this sense Old English had eorðbyrig "mound, embankment;" Old English eorðweorc meant "work on the land."

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Definitions of earthwork

earthwork (n.)
an earthen rampart;
From wordnet.princeton.edu