What does unmoor mean?
Unmoor is a verb meaning to release a boat or ship from whatever holds it in place, especially an anchor, chain, buoy, or other fixed point. Its opposite is moor, the act of securing a vessel with a mooring. The word is especially associated with maritime and nautical writing, where precise movement matters: a vessel may be moored at a dock, unmoored before departure, or unmoored as the tide changes. In ordinary conversation, people are more likely to say 'cast off' or 'leave the dock,' but unmoor preserves the specific technical idea of undoing a vessel's attachment. The verb can be transitive, as in 'unmoor the boat,' or intransitive, describing the vessel itself coming free from its mooring. It is a useful word for readers interested in sailing, shipping, port operations, and nautical history.
verbTo release a vessel from its mooring, such as an anchor, chain, buoy, or other fixed point. It can also refer to a vessel becoming free from its mooring.
- To release a vessel from its mooring or make it ready to depart.
"The crew waited for the tide to rise before they unmoored the fishing boat."
"The crew unmoored the small research vessel and steered toward the open water."
"The ferry unmoored as the last passengers boarded."
Unmoor is the nautical opposite of moor: one secures a vessel to the world, while the other sets it free.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unmoor come from?
Unmoor is an English compound formed with the negative prefix un-, meaning to undo or reverse, and the maritime verb moor, meaning to secure a vessel. The prefix changes the meaning from fastening a boat or ship to releasing it from its attachment. Its development is closely tied to the vocabulary of ports, harbors, and navigation, where the distinction between being moored and being free of a mooring is essential.
Related word forms
How unmoor is actually used
Chiefly maritime and technical, though the word also occurs in general nautical writing. It is more specific than simply 'leave' and generally implies releasing a vessel from an anchor, chain, buoy, or other mooring point.
Easily confused with unmoor
To moor a vessel is to secure it to an anchor, chain, buoy, or other fixed point; to unmoor it is to release it from that attachment.