tunnels Definition

burrow, underground, underpass, subway, subways, crossing, tolls, galleries, drifts, outlays, toll, expenditures, spending, expenditure, spent, expended, spend, disbursed, cht, underpasses, whc, passageways, viaducts, caves, sarcophaguses, caverns, crossings, corn borer moth, bridges, trench, roadbed, shafts, aqueducts, verrazano narrows, caissons, fortifications, alleys, staircases, burrows, bunkers, catacombs, canals, corridors, walkways, overpasses, tramway, sewers, belowground, trestles, ventilation shaft, adits, throughway, reinforced concrete, postholes, overland, pipes, mazes, manhole, guideway, highways, carriages, mineshaft, millrace, cellars, alleyways, drawbridges, warren, cloverleafs, channel tunnel, stalactites, excavations, ratlines, elevators, snowshed, aswan dam, wormholes, trains, rockface, jackhammers, archway, bailey bridge, crevices, drainpipes, mines, roads, stairways, entrances, truss bridge, manway, rockwork, aerotrain, potholing, pipelines, skyscrapers, overpass, tombs, cisterns, blowtorches, mousehole, courtyards,