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

suddenly in a flash quick as a flash in the twinkling of an eye before you can say Jack Robertson in two shakes of a lamb's tail quick as anything quick as a fox quick as lightning

Antonyms

deliberately steadily lazily languidly belatedly unhurriedly

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