tunnel
noun
[ ˈtʌn(ə)l ]
• an artificial underground passage, especially one built through a hill or under a building, road, or river.
• "a road tunnel through the Pyrenees"
Similar:
underground passage,
subterranean passage,
underpass,
hole,
burrow,
shaft,
gallery,
subway,
mine,
sap,
• short for wind tunnel.
• a long, half-cylindrical enclosure used to protect plants, made of clear plastic stretched over hoops.
• "cover plants in rows with a cloche tunnel"
tunnel
verb
• dig or force a passage underground or through something.
• "he tunnelled under the fence"
• (of a particle) pass through a potential barrier.
Origin:
late Middle English (in the senses ‘tunnel-shaped net’ and ‘flue of a chimney’): from Old French tonel, diminutive of tonne ‘cask’. tunnel (sense 1 of the noun) dates from the mid 18th century.
