Definition of all at once All at once
We found 2 definitions of all at once from 2 different sources.
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What does all at once mean?
Wiktionary 
- all at once (Adverb)
Unexpectedly; without warning; all of a sudden .
Wikipedia 
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All at Once is known to be the 5th single off the album "How to Save a Life" by the rock band The Fray.
Airplay.
The song is not originally famous for anything but being on airplay in the U.S. area.
Music Video.
The video was premiered on VH1's VSpot Top 20 Countdown. The video reached at #6 on VH1 and #20 on the "Hot Adult Top 40 Tracks".
