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all at once

 
See:
all, once
part of speech: phrase
definition 1: When something happens all at once, it happens very suddenly.
All at once, the building started shaking and we thought it was an earthquake.
definition 2: If people are doing something all at once, they are doing it all at the same time. If people jump into a swimming pool all at once, they all jump in at the same time. If you put five sticks of gum in your mouth all at once, you put all of them in your mouth at the same time. You don't put them in one at a time.
I couldn't understand what happened because everybody was talking all at once.The recipe says to pour the liquid into the other ingredients all at once.