A trace left by something that is too quick to see.
He calmly lied to me a blue streak, and he knew that I knew he was lying
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(informal, originally, US) A great deal of fast talking, cursing, lying, or similar.
interspersing his vehement comments with a ‘blue streak’ of oaths
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.