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swear upon. In DICTIOUS you will not only get to know all the dictionary meanings for the word
swear upon, but we will also tell you about its etymology, its characteristics and you will know how to say
swear upon in singular and plural. Everything you need to know about the word
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English
Verb
swear upon (third-person singular simple present swears upon, present participle swearing upon, simple past swore upon, past participle sworn upon)
- (transitive, formal) To take an oath on someone or something.
to swear upon the Holy Writ to speak the truth
1610–1611 (date written), William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies (First Folio), London: Isaac Iaggard, and Ed Blount, published 1623, →OCLC, :I'll swear upon that bottle to be thy true subject, for the liquor is not earthly.