abri approach trench aqueduct bunker canal canalization channel communication trench confirmation countermine coupure crimp cut deep-rootedness deep-seatedness dike ditch double sap dugout embedment encroachment entrance establishment fire trench fixation fixedness fixity fixture flying sap fortified tunnel fosse foxhole gallery goffer gutter ha-ha impingement implantation imposition incursion infiltration infixion influx infringement injection inroad insinuation interference interjection interloping interposition interposure interruption intervention intrusion invasion inveteracy irruption kennel mine moat obtrusion parallel pleat sap slit trench stabilization sunk fence trench trespass trespassing trough tunnel unlawful entry