before you know it

⏳ Time
Meaning
To happen so quickly that you hardly notice.
Literal Meaning
Before you become aware of it.
Example
“We'll be on vacation before you know it!”

More in Time

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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