as a flash
quick as a flash
(especially of a person's response or reaction) happening or made very quickly
RELATED IDIOMS :
flash in the pan
a thing or person whose sudden but brief success is not repeated or repeatable
This phrase developed from the priming of a firearm - the flash being from an explosion of gunpowder within the lock.
1998 - New Scientist - But Java may turn out to be flash in the pan : books on human computer interaction struggle to stay abreast of rapid developments in computing.
quick as a flash :
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