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Definition of tunnel : 1. A level passage driven across the measures, or at right angles to veins which it is desired to reach; - distinguished from the drift, or gangway, which is led along the vein when reached by the tunnel.
2. A vessel with a broad mouth at one end, a pipe or tube at the other, for conveying liquor, fluids, etc., into casks, bottles, or other vessels; a funnel.
3. An artificial passage or archway for conducting canals or railroads under elevated ground, for the formation of roads under rivers or canals, and the construction of sewers, drains, and the like.
4. The opening of a chimney for the passage of smoke; a flue; a funnel.
5. To catch in a tunnel net.
6. To form into a tunnel, or funnel, or to form like a tunnel; as, to tunnel fibrous plants into nests.
7. To make an opening, or a passageway, through or under; as, to tunnel a mountain; to tunnel a river.

Synonyms:

crosscut, crawl space, underground passage, mine, tube, pit, crawlway, subway, drift, adit, burrow

pole, stem, bar, post, rod, flagpole, stick, mine shaft, stalk, shaft, staff, elevator shaft

Usage examples:

• It was here that the great tunnel ran across the Menin road, from which forty- one Germans were taken. - "From Bapaume to Passchendaele, 1917", Philip Gibbs.
• Then for the first time he rested; he leaned against the brick- lined side of the tunnel and passed his blackened hands over his face. - "By What Authority?", Robert Hugh Benson.
• Instead, they saw a round, smooth opening into what seemed to be another tunnel. - "Boy Scouts in Mexico; or On Guard with Uncle Sam", G. Harvey Ralphson.