in one fell swoop
idiomPart offell
in one fell swoop — idiom
1. All in a single action or at the same time, especially when the action is swift
1.idiom
Definition
All in a single action or at the same time, especially when the action is swift and has a big effect.
Example
The company laid off three hundred workers in one fell swoop.
The storm destroyed the entire village's crops in one fell swoop.