Usage Note
sous-marin literally means 'under-sea'. The plural is sous-marins. As an adjective it means 'underwater' (câble sous-marin = 'undersea cable'). In French slang, a sous-marin can also refer to a planted agent or mole.
Examples
"Le sous-marin a plongé à grande profondeur."
Natural Translation
The submarine dived to great depth.

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