Tra từ swear - Từ điển Oxford Advanced Learner 8th

swear [swear swears swore swearing sworn] BrE [sweə(r)] NAmE [swer] verb (sworeBrE [swɔː(r)] ; NAmE [swɔːr] swornBrE [swɔːn] ; NAmE [swɔːrn] )
1. intransitive to use rude or offensive language, usually because you are angry
• She fell over and swore loudly.
• I don't like to hear children swearing.
•~ at sb/sth Why did you let him swear at you like that?
2. transitive, no passive to make a serious promise to do sth
Syn: ↑vow
•~ sth He swore revenge on the man who had killed his father.
•~ (that)… I swear (that) I'll never leave you. ‘That’ is usually left out, especially in speech.
•~ to do sth She made him swear not to tell anyone.
3. transitive to promise that you are telling the truth
•~ (that)… She swore (that) she'd never seen him before.
• I could have sworn (= I am sure) I heard the phone ring.
•~ to sb/on sth (that)… I swear to God I had nothing to do with it.
4. intransitive, transitive to make a public or official promise, especially in court
•~ (on sth) Witnesses were required to swear on the Bible.
•~ that… Are you willing to stand up in court and swear that you don't recognize him?
•~ to do sth Remember, you have sworn to tell the truth.
•~ sth Barons had to swear an oath of allegiance to the king.
5. transitive ~ sb to secrecy/silence to make sb promise not to tell sth to anyone
•Everyone was sworn to secrecy about what had happened.
see also ↑sworn
Idioms: ↑swear blind ▪ ↑swear like a trooper
Derived: ↑swear by somebody ▪ ↑swear off something ▪ ↑swear somebody in ▪ ↑swear somebody into something ▪ ↑swear to something
Verb forms:

Word Origin:
Old English swerian of Germanic origin; related to Dutch zweren, German schwören, also to ↑answer.

Example Bank:
•He heard her swear under her breath.
•He made her swear on the Bible that she wouldn't leave him.
•He swears up and down that he trusts me.
•He swore loudly at her and left.
•He swore solemnly that he would never hit her again.
•I swear by Almighty God to tell the truth.
•I swear to you, I don't know anything.
•I would be prepared to swear on oath that they didn't see me.
•Lincoln was sworn into office on March 4, 1861.
•We were all sworn to secrecy about the plan.
•Are you willing to stand up in court and swear that you don't recognize him?
•He swore blind that you knew all about it.
•I don't like to hear children swearing.
•I swear (that) I'll never leave you.
•I swear to God I had nothing to do with it.
•I think I put the keys back in the drawer, but I couldn't swear to it.
•She fell over and swore really loudly.