
in a flash 
IDIOM
in a flash (of the eye) :درانی، بیک چشم برهم زدن
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 English Dictionary
English Dictionaryin a flash (
ALSO quick as a flash) 
INFORMALquickly or suddenly: The ceremony was over in a flash.
 The ceremony was over in a flash.  [TahlilGaran] Advanced Learner's Dictionary ▲
  Idioms
Idiomsin a flashsuddenly. She remembered the answer in a flash.
 She remembered the answer in a flash. I heard her scream and in a flash was back in the house.
 I heard her scream and in a flash was back in the house.  [TahlilGaran] English Idioms Dictionary ▲
 in a flashquickly
 I was finished with the job interview in a flash.
 I was finished with the job interview in a flash.
  [TahlilGaran] English Idioms Dictionary ▲
 in a flash adv. phr. Very suddenly. 
 We were watching the bird eat the crumbs; then I sneezed, and he was gone in a flash.
 We were watching the bird eat the crumbs; then I sneezed, and he was gone in a flash.  Bob was looking over his notes for English class and in a flash he knew what he would write his paper about.
 Bob was looking over his notes for English class and in a flash he knew what he would write his paper about.  [TahlilGaran] English Idioms Dictionary ▲