manhole, stope, roadbed, shaft, subgrade, revetment, slit trench, culvert, winze, adits, excavation, colluvium, posthole, tunnel, creek bed, sinkhole, rockface, drainage ditch, streambed, mineshaft, caissons, anhydrite, talus, sump, crawlspace, alluvium, reinforced concrete, gun emplacement, dolerite, ravine, gossan, waterline, falsework, mylonite, anticlines, tensional, rock outcrop, slab, soakaway, riverbed, excavator, berm, ditches, cavity, ventilation shaft, auger, underground, crevice, retaining wall, roadway, digging, vein quartz, abutment, posthole digger, sandhog, millrace, cavern, trackway, eluvial, pelitic, outcrop, snowshed, syncline, dolomite, graben, crosscut, pipe, subbase, crater, gulch, subsurface, embankment, pavement, geotechnical, anastomosing, tarmacadam, earthworks, creek, overpass, headrace, floor joist, manway, loess, drainpipe, backhoe, mud, footwall, hillside, trencher, embayment, ridge, laths, veinlet, pelite, ledge, manto, anticline, overburden, norite, mousehole, swale, breccia, trenches, ditch, pier, moat, pit, trough, gully, caisson, bay, corridor, dock, quay, shelf, aisle, basin, courtyard, dike, ramp, canyon, bridge, sewer, aboveground, braced, rammed, brick, corbelled, frame, basement, block, canal, castellated, cubical, fortress, megalithic, multistory, panel, reef

approach trench, communication trench, fire trench, fosse, furrow

approach trench, communication trench, cut, dig in, ditch, entrench, fill, fire trench, furrow, gash, slit trench

entrenchment, intrenchment

depression, dig, dig out, encroach, excavate, hollow, impinge, infringe, natural depression, take advantage, trespass, verge