underway

{{Short description|State of a vessel free to move through the water}}

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{{Wiktionary}}

Underway, or under way, is a nautical term describing the state of a vessel which is unconstrained from horizontal translational movement relative to the water and the ground. "Way" arises when there is sufficient water flow past the rudder of a vessel that it can be steered. A vessel is said to be underway if it meets the following criteria:{{Cite web |title=COLREGs course - Underway |url=https://ecolregs.com/index.php?Itemid=505&id=197:underway&lang=en&option=com_k2&view=item |access-date=2023-09-07 |website=ecolregs.com |language=en-gb}}

• It is not aground
• It is not at anchor
• It has not been made fast to a dock, the shore, or other stationary object.

If a vessel is adrift and not being propelled by any instrument or device, it is said to be underway, not making way.{{Cite web |title=Vessel making way or under way? – Malta Sailing Academy |url=https://msa.maltasailingacademy.com/general-interest/vessel-making-way-under-way/ |access-date=2023-09-07 |website=msa.maltasailingacademy.com}}

"Under weigh" is a variation, coming from folk etymology, first used in 1749. "Under way" is likely from the Dutch onderweg or Middle Dutch onderwegen (lit. "under" or "among the ways"). Weigh is also a synonym for hanging or dangling, so that the process of raising an anchor, which causes it to hang at the end of the anchor-rope or chain is called “weighing [the] anchor” which leads to confusion between weigh and way, since both are pronounced identically.Merriam-Webster Mobile Dictionary, 2015, entries for "under weigh" and "under way".