Tunnel (noun / verb) — نفق أو مَمر: An underground passage; to dig such a passage. Below are 6 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
A road or tunnel passing under another road.
A long narrow pole or vertical passage; also a ray of light.
Dig; tunnel; excavate; bore; delve; penetrate; underground passage
An underground railway in a city; in British English, an underground pedestrian passage.
passagedig
To dig out earth, especially to uncover something buried.