trench Synonyms

ditch pit furrow trough cut gully depression excavation encroach groove impinge channel entrench hollow sewer mink slotted spillway waterway mackinaw strath sulcus rabbet rut rille ravine moat murage pipe notch palisade pothole undercut fire trench Holes Pitt septic tank slit trench entrenched grooves hollow out oceanic abyss entrenchment valley pits abyssal zone air-raid shelter anorak watercourse dig out