adverb simultaneously or suddenly
preposition used to indicate that something happens or is done at the same time or in a very short period of time
In music composition, a sudden change in dynamics or tempo can be indicated as 'all at once'.
Authors may use the phrase 'all at once' to describe a sudden and unexpected event or revelation in a story.
When preparing a dish, certain ingredients may need to be added 'all at once' to achieve the desired flavor profile.
Athletes may need to react 'all at once' to a fast-paced play or unexpected change in the game.
During a crisis situation, emergency responders may need to act 'all at once' to address multiple urgent tasks simultaneously.
In the world of writing, 'all at once' may refer to a sudden burst of inspiration or the simultaneous occurrence of multiple events in a narrative.
Psychologists may use the term 'all at once' to describe a client experiencing a sudden onset of symptoms or emotions.
In project management, 'all at once' could refer to the need to address multiple issues or tasks simultaneously to meet a deadline or goal.
Chefs might use 'all at once' to describe the process of preparing and cooking multiple dishes to be served together in a timely manner.
Software developers may use 'all at once' to describe the simultaneous execution of multiple functions or processes within a program.