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English definition of “swear”

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 verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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