This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of breastwork.

"But if you know the trail through the paddies, you can walk among the weeds, cross the shallow dip which was a moat, pass by lumps of rain-pressed earth once called breastworks and stand on a flat place so hard packed the grass does not grow."

breastwork    revetments    blockhouse    minefield    earthwork    palisade    barricade    revetment    bastion    stockade