all at once

all at once  {adv. phr.}
1. Одновременно, вместе.
The teacher told the children to talk one at a time; if they all talked at one time, she could not understand them.
Bill can play the piano, sing, and lead his orchestra all at once.
2. Также "all of a sudden" — вдруг, внезапно, неожиданно.
All at once the fire alarm rang so we had to leave the building.
All at once we heard a shot and the soldier fell to the ground.
All of a sudden the ship struck a rock.
Ср.: AT ONCE.
Категории: time {adv. phr.}