Definition Swear

English vocabulary and translations (See all our English vocabulary translation)

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to swear: to confirm, to promise, to testify; to blaspheme, to curse, to say impolite words
I swear to you that I didn't realize it was your sandwich that I ate! Please believe me!
Do you swear to tell the truth? Do you promise not to lie?
He swears like a sailor. He uses really rude language.

This is an irregular verb:
I swear / I swore / I have sworn

(I) swear by (Delavigne products): (I) completely trust in, have complete faith in (Delavigne products)
Pronunciation examples
UK: I swear to tell the truth, the whole truth, and nothing but the truth.
US: Don't swear at me: it's very rude.


  • "Brian : It was out of bounds, I swear!"
  • "I swear I didn't know he was an illegal in this country."
  • "They swear by Kalvin Krime and Grevelon merchandise."
  • "but I swear I didn't kill him!"
  • "And I swear the other day he frowned at me!"
  • "Kevin : Sir, it's not that I don't have any money it's just that I don't have any money on me, I swear."
  • "They never swear and spit, and my god, they look good in those tight shirts!"
  • "In addition to using all-natural ingredients, the new line (code-named "WorldBlends") is produced under humane conditions: the company has sworn to work only with manufacturers approved by human rights watchdog group P."
  • "I can't be sure, but I would swear they were almost like normal human beings: smiling, frowning, yawning."

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