swear S2 past tense swore past participle sworn
to use rude and offensive language:
Don't swear in front of the children.
He turned round and swore at me.
to promise that you will do something
Victor swore he would get his revenge.
swear to do something
Mona swore never to return home.
Do you swear on your honour (=promise very strongly) that you will never tell anyone?
to say very strongly that what you are saying is true:
state the truth[intransitive and transitive] informal
I never touched your purse, I swear!
He says he was there all the time, but I swear I never saw him.
swear blind British English (=say very strongly)
She swore blind that she had never seen him before.
I never touched her, I swear to God.
I think it was about ten o'clock when we left, but I couldn't swear to it (=I am not certain).
used to say that someone was sure about something but now they think they were wrong:
I could have sworn I had my keys.
to make a public official promise, especially in a court of law
public promise[intransitive and transitive]SCL
Witnesses have to swear on the Bible.
Remember that you have sworn an oath and so must tell the truth
Presidents must swear allegiance to the US constitution.
to make someone promise not to tell anyone what you have told them
—swearing noun [uncountable]
He was cautioned for swearing.
lots of shouting and swearing
swear by somethingphrasal verb
He swears by vitamin C pills.
swear somebody ↔ inphrasal verb
The new governor will be sworn in next week.
The jury have not yet been sworn in.