before you can say Jack Robinson

⏳ Time
Meaning
To happen suddenly or without warning.
Literal Meaning
Before one can mention a name.
Example
“The storm rolled in before you could say Jack Robinson.”

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In the nick of time

Just barely in time; at the last possible moment.

Once in a blue moon

Very rarely; an event that occurs infrequently.

At the eleventh hour

At the last possible moment before a deadline.

1 o'clock "sharp"

exactly at 1 o'clock without delay