Definition of before one can say Jack Robinson in English:

before one can say Jack Robinson

informal Very quickly or suddenly.
More example sentences
  • A friend of mine in Brixton kept koi carp in a raised toilet and this heron came straight in and ate the fish before you could say Jack Robinson.
  • Yet, with a ton of people assigned to wait on customers - eight clerks were politely servicing people - I had my onion bagel with vegetable tofu spread and a juice before one could say Jack Robinson.
  • The canoe slides into the water in the blink of an eye and before you can say Jack Robinson it's twenty yards off shore.
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Definition of before one can say Jack Robinson in:

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reject (someone or something) in an abrupt manner…