very suddenly
in a very short duration
I wanted to have a meaningful conversation with him when he was back from work but he was gone before I could say Jack Robinson.
Men always tend to avoid messy subjects and arguments. They would be gone before you can say Jack Robinson, mark my words.
His house was already built before one could say Jack Robinson.
The judge sentenced him to life imprisonment before the defense lawyer could say Jack Robinson.
After the professional fees were announced, the patient disappeared from the ward before the nurse could say Jack Robinson.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.