A tool first, a weapon in the older books
In present-day English a bodkin is almost always a household or workshop implement. Dressmakers keep a blunt, large-eyed needle of that name to run ribbon, elastic, or cord through a hem. Leatherworkers and tailors still use a sharper, awl-like version to punch holes. A long ornamental hairpin can share the word, and nineteenth-century printers used a steel pick of similar shape to lift a single letter from a page of metal type. The dagger sense has not vanished, but it now lives mainly in older literature and in dictionary labels marked archaic.
English has applied one name to a family of slim, pointed objects, and the earliest of those objects was a short blade.
First appearance in Middle English
The noun is already in English in the fourteenth century. Middle English spellings include boidekin, boydekin, bodekin, and badeken: three syllables at first, with a diphthong in the root. Some etymological dictionaries round the arrival to about 1300. The Oxford English Dictionary’s earliest firmly dated evidence is from 1386, in Geoffrey Chaucer. In the Monk’s Tale, Brutus and the other conspirators stab Caesar with boydekyns. In the Reeve’s Tale a miller threatens death with knife or boydekyn. A parliamentary roll from the 1460s lists boytkyns among daggers and wood-knives.
The same form was already more than a weapon. The Promptorium Parvulorum, a Latin-English glossary of about 1440, treats boydekyn as a piercing tool. An astronomical handbook from the 1390s tells the reader to take a renspindle or a boydekyn and make a small hole. Middle English could also use the word for a pestle. From the start, the name covered a short stabbing point and the punch that resembled one.
How it entered the language is the unsettled part. It is not an obvious inheritance from Old English, and no securely recorded Latin or Old French parent stands behind it. Standard historical dictionaries therefore treat it as a Middle English word of unknown source rather than as a native survival or a routine Romance loan.
A diminutive ending on an opaque root
The last syllable looks like the diminutive ending -kin, the same piece seen in lambkin, napkin, and pet-forms such as Watkins and Jenkins. That ending came into English from Middle Dutch -kijn and was productive in the later Middle Ages. Early modern etymologists noticed it at once. John Minsheu, working in 1617, took the whole noun to be Dutch on the strength of the suffix. Stephen Skinner, in 1671, instead parsed it as a native diminutive of body. Neither account survives scrutiny. A Dutch-style ending does not prove that the root is Dutch: English has many mixed formations. Body, for its part, never had a Middle English shape boyde, and a dagger is not a small body.
The first syllable is the real difficulty. The form most often set beside Chaucer’s boidekin is Scottish Gaelic biodag, a dagger. Welsh bidog and related Irish words have been cited as well. The resemblance is genuine, and some desk dictionaries still say the English noun is probably Celtic. The comparison does not settle the history. The Gaelic word’s own background is obscure, and it is not certain which language lent to which: biodag could as easily have been taken from Scots or Middle English as the other way around. The Century Dictionary already rejected a Celtic source. The Oxford English Dictionary now marks the English noun as of unknown origin. American Heritage does the same. The origin of the word bodkin remains, in that strict sense, unsolved.
Other reconstructions have not lasted. Walter Skeat later proposed an Anglo-French form related to Dutch beitel, a chisel. Ernest Weekley imagined an unattested Anglo-French diminutive meaning a little box, with the sheath standing for the blade. The Middle English Dictionary floats a speculative Old French compound built on a word for a wedge. None of those etyma is well enough attested, and early spellings swing among a, o, i, and oi in the first syllable, so a single ancestral vowel is hard to recover. Scots cousins such as botkin and boitkin show that the word was at home in the north as well as the south, but they do not explain the root.
Dagger, punch, pin, and the person in the middle
The oldest literary sense is the short dagger or stiletto. Shakespeare still uses it that way in Hamlet, when the prince weighs ending his life with an unadorned blade. That weapon sense faded from ordinary speech. By the time modern dictionaries list it, they mark it obsolete or archaic.
The tool senses were already Middle English and then specialized. From a punch for cloth or leather it is a short step to a large-eyed blunt needle that draws tape through a channel rather than piercing a hide. Hairdressing took the name in the late sixteenth century. John Baret’s dictionary of 1580 defines a bodkine as a fine instrument with which women curl their hair, and also as a large needle used to crest or part the hair. The ornamental hairpin grows out of the same long, stiletto-shaped object worn in a coil of hair. Early colonial finds include both lacing needles with an eye for ribbon and decorative headpins without one.
Printers later borrowed the name for a steel pick used to extract or replace a single type character, a sense the OED places in the 1840s. Archaeologists also use the word for a long, narrow armor-piercing arrowhead, another spike named by shape.
A separate figurative path produced the squeezed passenger. To sit or ride bodkin was to be wedged between two people in a seat meant for two, the image being a thin blade slipped into a tight gap. An isolated seventeenth-century stage use already applies the name to the third person forced into a bed made for two. By the late eighteenth century the image is a coach passenger squeezed into the middle place. Dialect records even applied the word to a three-horse team yoked two behind and one in front. That passenger sense is now rare, but it shows how far a name for a slim point could travel once the dagger was no longer the default meaning.
One early form worth keeping
The form that still anchors the history is Chaucer’s boydekyn: three syllables, a diphthong in the root, and a conspirator’s blade. A Celtic dagger-name is the comparison most often offered and the one least easy to prove. The sewing implement in a modern workbasket is the same noun, grown thinner.