A bar you stand on, and a rank you occupy
In present-day English, a rung is usually one of the short crosspieces of a ladder: the part a foot or a hand actually meets. The same noun covers the rounded brace between a chair’s legs, and, by a picture that barely needs explaining, a level in a ranking: the bottom rung of a firm, a higher rung on a pay scale, the next rung of a profession. Merriam-Webster still lists a Scottish use for a heavy staff or cudgel. That older, broader “stick” reading is no longer the default, but it is not a late invention. It is what the word used to mean more freely.
English also writes rung as the past participle of the verb ring, of a bell that has already sounded. That form is a different word. The noun is inherited Germanic vocabulary for a rod or bar. The participle is an old strong-verb shape of ring. They coincide in spelling and sound; they do not share a history.
Native English, from a word with an h
The origin of the word rung is Old English hrung, already in the language before 1000. It was a feminine noun. Late Old English uses it for a rod, a cross-bar, or a stout rounded stick. Bosworth-Toller’s Anglo-Saxon dictionary glosses staff, rod, beam, and pole, and points to an Exeter Book riddle in which men load a wagon under a hrung — most likely a supporting pole or beam on the vehicle, not yet a numbered step on a ladder.
Middle English kept the noun as rung, runge, rong, ronge, and nearby spellings, including forms in place names. The opening h of the Old English cluster hr- fell away, just as it did when hring became ring and hlæder became ladder. What later English received was the vowel-plus-ng shape still in use.
The path is inheritance, not borrowing. Nothing here is a French loan after 1066, and nothing is a learned Latin import. The word came up through West Germanic into English and stayed.
Germanic kin, and a stop in the trail
Behind Old English sits Proto-West Germanic *hrungu and Proto-Germanic *hrungō (some handbooks write the latter as *khrungo). Related words are easy to find inside the family and hard to find outside it. Gothic has hrugga for a staff. Old High German runga and modern German Runge name a stake, stud, or stave. Middle Low German has runge; Middle Dutch ronghe and Dutch rong mean a pole or stanchion. Those cousins kept a general “bar, stake, staff” range. English is the language that later treated the ladder step as the ordinary sense.
Further back, the trail ends. Standard etymological accounts treat the deeper source as unknown and give the word no secure relatives outside Germanic. Celtic lookalikes, where they exist, are usually taken as borrowings from English rather than as independent inheritances. Merriam-Webster offers a different, and explicitly tentative, comparison: Old English hrung is akin to Gothic hrunga and perhaps to Old English hring, “ring.” The shared hr- onset and a rounded cross-section make the idea tempting. It is not a settled equation. No Indo-European root is firmly attached, and the honest reading is that the Germanic noun is solid while any link to ring remains a maybe.
There is little morphology to unpack. Rung is a simple native noun, not a prefix stacked on a root. Later English added ordinary formations on it: the adjective runged, and compounds such as bottom rung and top rung. Irish runga is a borrowing from the English noun, a small export of a word English itself had already narrowed.
How the sense tightened
By the late thirteenth century the English meaning had begun to specialize as the round or stave of a ladder. Merriam-Webster dates that ladder-crosspiece sense to the fourteenth century. The slight mismatch of “late 13c.” and “14th century” is a matter of which early Middle English examples a dictionary chooses to count as first, not two separate words. Chair rungs, spokes of a wheel, stakes of a cart, a floor timber in a ship, the radial handles of a steering wheel, and the pins of a lantern wheel all rest on the same physical idea: a short, strong member set across something longer. Most of those technical readings are now dated or specialist.
The ladder sense became so normal that some speakers in the eighteenth and nineteenth centuries treated rungs as a sloppy stand-in for rounds, the rival name for a ladder’s circular steps. An 1816 collection of American vocabulary recorded the view that educated usage preferred rounds. The older Germanic noun won the contest. Rung stayed in standard English; the prestige correction did not stick.
Once the ladder picture was fixed, rank was an easy next step. A hierarchy is talked about as something a person climbs, so a position becomes a rung. The image of a career or corporate ladder is nineteenth-century English; career ladder is recorded from 1835. Modern prose leans on it constantly: a first job as the lowest rung, a promotion as a move up a few rungs. The metaphor did not rewrite the etymology. It borrowed a carpenter’s part and used it for social height.
A cousin that never climbed
German Runge is still a stake or wagon stave, closer to the Old English staff and pole than to a numbered grade at work. That is the useful check on the English story. Speakers did not mint a ladder word from nowhere. They inherited a Germanic name for a stout bar, dropped the h, and then, from the late Middle Ages onward, used it most often for the piece a climber stands on — and, much later, for the rank that piece came to stand for.