a deep, wide excavation that is usually filled with water and that goes around the walls of a place (such as a castle) to protect it from being attacked
ha-ha, stank(British dialect), sunk fencedike, ditch, fosse(or foss), gutter, sheugh(chiefly Scottish), trench, troughacequia(Southwest), culvert, drain, draw, gully(also gulley), ravinedrill, furrowkennel
in the 14th century
英语同义词词典收录了63618条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。