before you can say Jack Robinson

Meaning

before you can say Jack Robinson

Very quickly; quicker than one expects.

You have to be careful in that area. They'll have your wallet before you can say Jack Robinson.
Synonym: before you can say knife

Source: en.wiktionary.org

Synonyms

cursorily suddenly instantaneously here and now against the clock in no time in a flash unhesitatingly in the twinkling of an eye quick as a flash before you can say Jack Robertson in two shakes of a lamb's tail quick as anything quick as lightning quick as a fox

Antonyms

later subsequently gradually slowly deliberately steadily
Show all antonyms

Words in the phrase

before you can say Jack Robinson

Close letter words and terms

before work hours before working hours before you can say Jack Robertson before you can say knife before you could say jack robinson before you know it