The story
From the afterimage of a stroke of lightning, which looks like a blue streak across the sky.
Etymology from Wiktionary, CC BY-SA 4.0.
blue streak
Today it means: A great deal of fast talking, cursing, lying, or similar. Full definition →
Today it means: A great deal of fast talking, cursing, lying, or similar. Full definition →
From the afterimage of a stroke of lightning, which looks like a blue streak across the sky.
Etymology from Wiktionary, CC BY-SA 4.0.