Synonyms for trench

ditch, rut, hollow, gully, depression, gutter, tube, furrow, drainage canal, creek, moat, dike (British), drain, channel, main, gorge, gulch, arroyo. see also defense 2.

Military trenches include: dugout, earthwork, moat, sap, redoubt, breastwork, entrenchment, fortification, pillbox, excavation, revetment, bunker, strong point, machine-gun nest, communication trench, front-line trench, slit trench, approach trench, tank-trap, foxhole;