Meanings
verbswear upon (third-person singular simple present swears upon, present participle swearing upon, simple past swore upon, past participle sworn upon)
present singular third person swears upon · participle present swearing upon · past swore upon · participle past sworn upon · alternative swear on
- formaltransitiveTo take an oath on someone or something.
to swear upon the Holy Writ to speak the truth
1 more example
I'll swear upon that bottle to be thy true subject, for the liquor is not earthly.
1610–1611 (date written), William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act II, scene ii]
Cite this entry
APA
swear upon. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/swear%20upon
MLA
“swear upon.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/swear%20upon. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “swear upon,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/swear%20upon.
Source: swear upon on Wiktionary, CC BY-SA 4.0.