deiero.
to swear (take an oath)
Meaning & usage
to swear (take an oath)
Where this word comes from
Etymology tree Proto-Indo-European *de Proto-Indo-European *-h₁ Proto-Indo-European *déh₁ Proto-Italic *dē Latin dē Latin dē- Proto-Indo-European *h₂ey- Proto-Indo-European *-u Proto-Indo-European *h₂óyu Proto-Indo-European *h₂yew- Proto-Indo-European *-os Proto-Indo-European *h₂yéwos Proto-Italic *jowos Archaic Latin *iowos, *iowez- Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-yéti Proto-Indo-European *-eh₂yéti Proto-Indo-European *-h₂tiinflu. Proto-Italic *-ājō Proto-Italic *-āō Archaic Latin -ō Archaic Latin iovesō Latin iūrō Latin peierōinflu. Latin dēierō From dē- + iūrō. The e is due to contamination between periūrō (“swear falsely”) and peierō (“worsen”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.