reseau souterrain

Phonetic: "/ˈʌndəɡɹaʊnd/"

Part Of Speech: noun

Definition: An underground railway, especially for mass transit of people in urban areas.

Definition: A train that runs on such an underground railway.

Definition: A rapid transit system, regardless of the elevation of its right of way.

Definition: An underground walkway, tunnel for pedestrians (called pedestrian underpass in US).

Definition: An underground route for pipes, sewers, etc.

Phonetic: "/ˈʌndəɡɹaʊnd/"

Part Of Speech: noun

Definition: Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).

Definition: (with definite article) A movement or organisation of people who resist political convention.

Example: the French underground during World War II

Definition: (with definite article) A movement or organisation of people who resist artistic convention.

Phonetic: "/ˈʌndəɡɹaʊnd/"

Part Of Speech: verb

Definition: To route electricity distribution cables underground

Phonetic: "/ˈʌndəɡɹaʊnd/"

Part Of Speech: adjective

Definition: Below the ground; below the surface of the Earth.

Example: There is an underground tunnel that takes you across the river.

Definition: Hidden, furtive, secretive.

Example: These criminals operate through an underground network.

Definition: Outside the mainstream, especially unofficial and hidden from the authorities.

Example: underground music

Phonetic: "/ˈʌndəɡɹaʊnd/"

Part Of Speech: adverb

Definition: Below the ground.

Example: The tunnel goes underground at this point.

Definition: Secretly.

Part Of Speech: noun

Definition: A collection of organized things; a whole composed of relationships among its members.

Example: There are eight planets in the solar system.

Definition: A method or way of organizing or planning.

Example: Followers should have a system to follow that works in their interests, not against them.