A passageway through or under something, usually underground (especially one for trains or cars).

Roget 627: method, way, manner, wise, gait, form, mode, fashion, tone, guise; modus operandi, MO; procedure etc. (line of conduct) 692.    path, road, route, course; line of way, line of road; trajectory, orbit, track, beat, tack.    steps; stair, staircase; flight of stairs, ladder, stile; perron^†.    bridge, footbridge, viaduct, pontoon, steppingstone, plank, gangway; drawbridge; pass, ford, ferry, tunnel; pipe etc. 260.    door; gateway etc. (opening) 260; channel, passage, avenue, means of access, approach, adit^†; artery, lane, loan [Scot.], alley, aisle, lobby, corridor; back-door, back-stairs; secret passage; covert way; vennel^†.    roadway, pathway, stairway; express; thoroughfare; highway; turnpike, freeway, royal road, coach road; broad highway, King's highway, Queen's highway; beaten track, beaten path; horse road, bridle road, bridle track, bridle path; walk, trottoir^†, footpath, pavement, flags, sidewalk; crossroad, byroad, bypath, byway; cut; short cut etc. (mid-course) 628; carrefour^†; private road, occupation road; highways and byways; railroad, railway, tram road, tramway; towpath; causeway; canal etc. (conduit) 350; street etc. (abode) 189; speedway.    adv.. how; in what way, in what manner; by what mode; so, in this way, after this fashion.    one way or another, anyhow; somehow or other etc. (instrumentality) 631; by way of; via; in transitu [Lat.] etc. 270; on the high road to.    ... show more

Roget 350: conduit, channel, duct, watercourse, race; head race, tail race; abito^†, aboideau^†, aboiteau [Fr.], bito^†; acequia^†, acequiador^†, acequiamadre^†; arroyo; adit^†, aqueduct, canal, trough, gutter, pantile; flume, ingate^†, runner; lock-weir, tedge^†; vena^†; dike, main, gully, moat, ditch, drain, sewer, culvert, cloaca, sough, kennel, siphon; piscina^†; pipe etc. (tube) 260; funnel; tunnel etc. (passage) 627; water pipe, waste pipe; emunctory^†, gully hole, artery, aorta, pore, spout, scupper; adjutage^†, ajutage^†; hose; gargoyle; gurgoyle^†; penstock, weir; flood gate, water gate; sluice, lock, valve; rose; waterworks.    pipeline.    ... show more

Roget 260: hole, foramen; puncture, perforation; fontanel^†; transforation^†; pinhole, keyhole, loophole, porthole, peephole, mousehole, pigeonhole; eye of a needle; eyelet; slot.    opening; aperture, apertness^†; hiation^†, yawning, oscitancy^†, dehiscence, patefaction^†, pandiculation^†; chasm etc. (interval) 198.    embrasure, window, casement; abatjour^†; light; sky light, fan light; lattice; bay window, bow window; oriel [Arch.]; dormer, lantern.    outlet, inlet; vent, vomitory; embouchure; orifice, mouth, sucker, muzzle, throat, gullet, weasand^†, wizen, nozzle; placket.    portal, porch, gate, ostiary^†, postern, wicket, trapdoor, hatch, door; arcade; cellarway^†, driveway, gateway, doorway, hatchway, gangway; lich gate^†.    way, path etc. 627; thoroughfare; channel; passage, passageway; tube, pipe; water pipe etc. 350; air pipe etc. 351; vessel, tubule, canal, gut, fistula; adjutage^†, ajutage^†; ostium^†; smokestack; chimney, flue, tap, funnel, gully, tunnel, main; mine, pit, adit^†, shaft; gallery.    alley, aisle, glade, vista.    bore, caliber; pore; blind orifice; fulgurite^†, thundertube^†.    porousness, porosity.    sieve, cullender^†, colander; cribble^†, riddle, screen; honeycomb.    apertion^†, perforation; piercing etc. v.; terebration^†, empalement^†, pertusion^†, puncture, acupuncture, penetration.    key etc. 631, opener, master key, password, combination, passe-partout.    ... show more

Dutch: tunnel
Polish: tunel

A hole made by an animal, usually for shelter.

synonym: burrow.

Dutch: burcht, hol, vossegat, vossehol, vossengat

Move through by or as by digging.

synonym: burrow.

Roget 252: be concave etc. adj.; retire, cave in.    render concave etc. adj.; depress, hollow; scoop, scoop out; gouge, gouge out, dig, delve, excavate, dent, dint, mine, sap, undermine, burrow, tunnel, stave in.    ... show more

Roget 260: open, ope^†, gape, yawn, bilge; fly open.    perforate, pierce, empierce^†, tap, bore, drill; mine etc. (scoop out) 252; tunnel; transpierce^†, transfix; enfilade, impale, spike, spear, gore, spit, stab, pink, puncture, lance, stick, prick, riddle, punch; stave in.    cut a passage through; make way for, make room for.    uncover, unclose, unrip^†; lay open, cut open, rip open, throw open, pop open, blow open, pry open, tear open, pull open.    ... show more

Force a way through.