at a stroke; in one go; all at once
Describes doing something completely or dealing with many things in a single action, often with a sense of decisiveness or efficiency.
He solved the problem at a stroke.
The new president reformed the organization in one fell swoop.
The new system resolved several problems all at once.
Sales increased threefold all at once.
I cleared away all the piled-up work in one go.
The political situation changed dramatically all at once because of the election results.