underway
noun/ˈʌndə(ɹ)weɪ/
Etymology From under + way.
1
A road, track, path, or street for going under another way or obstacle; an underpass.
- As Minneapolis grew, the city demanded that M&StL construct "underways" beneath city roadways.2005, Donovan L. Hofsommer, “Adrift”, in Minneapolis and the Age of Railways, Univ. of Minnesota Press, →ISBN, page 152:
2
An underground passage, subway, tunnel.
- There are in fact many such subterranean underways in Germany, speeding traffic beneath bergs, burgs and villages and into and around and under big city downtowns ...2004, Alan Goldfein, “A Wonderful Drive”, in Europe's Macadam, America's Tar: How America Really Compares to "Old Europe", American Editions, →ISBN, page 46:
3
A voyage, especially underwater.
- I had been the diving officer on three previous submarines, …, and was an experienced officer of the deck with many underways and landings under my belt on all three.2008, Alfred Scott McLaren, William R. Anderson, “To Severnaya Zemlya and the Beginning of the Shelf Survey”, in Unknown Waters: A First-Hand Account of the Historic Under-ice Survey of the Siberian Continental Shelf by USS Queenfish (SSN-651), Univ. of Alabama Press, →ISBN, page 179: