English
do
Do comes from Old English dōn ‘to do’, from Proto-West Germanic *dōn ‘to do’, and ultimately from Proto-Indo-European *dʰeh₁- ‘to put, place, do, make’.
- Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁-1‘to put’reconstructed
- Proto-Germanicc. 500 BCE–200 CE*dōną1‘to do’reconstructed
- Proto-West Germanicc. 200–500 CE*dōn1‘to do’reconstructed
- Old Englishc. 450–1150dōn1‘to do’
- Middle Englishc. 1150–1500don1
- Englishearliest quotation 1490do1
attested reconstructed ? uncertain or disputed deepest recorded ancestor
- 1 Wiktionary, English do
- Earliest quotation in Wiktionary’s entry: 1490, William Caxton, Prologue: “And also my lorde abbot of westmynster ded do…”.
Lineage
- Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁-Wiktionary, English do‘to put’reconstructed
- Proto-Germanicc. 500 BCE–200 CE*dōnąWiktionary, English do‘to do’reconstructed
- Proto-West Germanicc. 200–500 CE*dōnWiktionary, English do‘to do’reconstructed
- Old Englishc. 450–1150dōnWiktionary, English do‘to do’
- Middle Englishc. 1150–1500donWiktionary, English do
- Englishearliest quotation 1490doWiktionary, English do. Earliest quotation in Wiktionary’s entry: 1490, William Caxton, Prologue: “And also my lorde abbot of westmynster ded do…”
The story
For senses 4 and 5, compare Old Norse duga, also Northern English dow. The past tense form is from Middle English didde, dude, from Old English dyde, *diede, an unexpected development from Proto-Germanic *dedǭ/*dedē (the expected reflex would be *ded), from Proto-Indo-European *dʰédʰeh₁ti, an athematic e-reduplicated verb of the same root *dʰeh₁-. The meaningless use of do in interrogative, negative, and affirmative sentences. "Yes, I do"), existing in some form in most Germanic languages, is thought by some linguists to be one of the Brittonicisms in English, calqued from Brythonic.
Word family
English words that share an ancestor with do, grouped by the ancestor they share, most familiar first.
through Proto-Indo-European *dʰeh₁- ‘to put, place, do, make’
- fact ← factum ← factus ← faciō
- deal ← delen ← dǣlan ← *dailijan ← *dailijaną
- hot ← hāt ← *hait ← *haitaz ← *kéHidos
- fair ← feyre ← foire ← fēriae ← *fēziās
- defense ← defens ← defens ← dēfēnsa ← dēfendō
- fan ← fanatic ← fānāticu
- benefit ← benefytt
- fashion ← facioun ← fechoun
- feature ← feture ← feture ← faiture ← factūra
- mid ← midd ← *midi ← *midjaz ← *médʰyos
- theme ← teme ← teme
- defence ← defens ← defens ← dēfēnsa ← dēfendō
164 more relatives in the full family tree
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Another origin of do
- Latinc. 75 BCE–200 CEDominus‘The Lord’
- Englishtodaydo
Coined by Italian musicologist Giovanni Battista Doni in 1635 as an easier-to-sing open-syllable revision to the solmization ut of Guido of Arezzo, from the first syllable of Latin Dominus (‘The Lord’) (speculated by some to be an ulterior abbreviation of Giovanni Battista Doni) on the pattern of other Latinate solfège with the stated justification that God is the tonic and root of the world.
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Today it means
verb A syntactic marker in a question whose main verb is not another auxiliary verb or be.
Sources
Sources: Wiktionary, “do”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.