Etymology
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breastwork (n.)

"fieldwork thrown up breast-high for defense," 1640s, from breast (n.) + work (n.) in "fortification" sense. Old English had breostweall in same sense.

updated on October 14, 2021

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Definitions of breastwork from WordNet

breastwork (n.)
fortification consisting of a low wall;
Synonyms: parapet
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.