What does topside mean?
Topside denotes the upper side or surface of an object, especially the upper side of a ship or vessel, and can also function as an adverb meaning on or toward that upper area. In nautical contexts, topside may indicate a position on or above the deck rather than below it. The noun's general sense is most readily illustrated by a form's visible upper surface, but the maritime sense gives the word much of its distinctive character. Related expressions such as “the topside of the world” are usually literary or informal, whereas bare topside often sounds technical, maritime, or deliberately terse. It is not usually used where “top” or “upper surface” would be more natural in neutral prose. Knowing topside is useful because it names a spatial relation that can be concrete, as on a vessel, or broader and figurative, as when describing a region or condition above another. The word is established in both British and American English, though its maritime associations are especially strong.
The upper side or upper surface of an object, especially the upper deck or exposed upper side of a vessel.
"A narrow walkway ran around the topside of the tank."
The maritime sense is common in both British and American English. The plural topsides is rare and chiefly used of a vessel's upper sides or surfaces.
On, at, or toward the upper side or deck; in nautical use, from a lower position to the deck or the area above it.
"The crew waited for the vessel to come fully topside."
This use is especially associated with nautical and military contexts.
The plural is rare and chiefly used in nautical descriptions of a vessel's upper sides or surfaces.
"Salt water streaked the boat's topsides."
At sea, “topside” is where a submerged silhouette becomes a ship with a deck.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does topside come from?
Topside is an English compound formed from top and side. Top descends from Old English top, meaning the highest point or upper surface, while side descends from Old English side; both elements are Germanic in origin. The compound's use in descriptions of ships and their decks helped give it its characteristic maritime association.
How topside is actually used
In general use, topside can sound literary or slightly old-fashioned compared with the plainer upper surface. In maritime contexts it is technical but natural, and it may refer specifically to the deck or the exposed side of a vessel. The expression “the topside of the world” is especially familiar in informal and figurative British English.