The idiom "swear a blue streak" originated from the idea of using profanity or vulgar language with such intensity and rapidity that it creates the impression of a continuous stream of blue (vulgar) language. Figuratively, it is used to refer to the act of expressing extreme anger, frustration, or annoyance by using a rapid and continuous string of curse words.

Определение и значение слова « swear a blue streak» на английском языке

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