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to swear a blue streak
01
to use offensive words in an intense and rapid manner
Idiom
Offensive
What is the origin of the idiom "swear a blue streak" and when to use it?
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.
Examples
When he dropped the box on his foot, he cursed a blue streak.
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