Moat
/mˈoʊt/
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Definition
(noun) A deep, wide defensive ditch, normally filled with water, surrounding a fortified habitation.
Sentence Examples
Most castles have a moat surrounding them.
Many castles are encircled by a moat.
CEFR Practice Quiz
The medieval castle was surrounded by a deep, water-filled ____ that was designed to protect it from any incoming enemy attacks.