out·work /ˌaʊtˈwɚ/
外堡;外壘;戶外工作
Out·work v. t. To exceed in working; to work more or faster than.
Out·work n. Fort. A minor defense constructed beyond the main body of a work, as a ravelin, lunette, hornwork, etc.
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outwork
n : subsidiary defensive structure lying outside the main
fortified area; "the outworks of the castle"