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English definition of “swear”

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swear

verb
 
 
/sweər/ ( past tense swore, past participle sworn)
BAD LANGUAGE [I] B2 to use language that people think is rude or offensive: He was sent home because he swore at the teacher. She swore loudly and threw the box on the floor.Swearing and blasphemy
PROMISE [I, T] B2 to make a serious promise: [+ to do sth] I swear to tell the truth. [+ (that)] She swore that she was at home at the time of the accident.Making and breaking promises and commitments
TRUE [T] used to say that you are sure something is true: [+ (that)] I could have sworn that she said she lived in Canterbury (= I was sure she lived in Canterbury, but now I have found that it is not true).Making and breaking promises and commitments
(Definition of swear from the Cambridge Learners Dictionary © Cambridge University Press)
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