one fell swoop

means: All at once. It may refer to the swooping of a predatory bird, with the indication that there was a cessation of life in the prey because of the word 'fell' which is seldom used except in the context of (that tree was felled some time ago)

I ate the handful of grapes in one fell swoop.

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rescue two squirrels in one fell swoop

Completing two tasks in one trip, for people who don't like to talk about violence against our feathered friends (i.e., "kill two birds with one stone")

Sarah: "I am going to go buy a Wii, let's go to Best Buy!"
Angie: "I need to get some milk at the grocery store, why don't we go do both, so we can rescue two squirrels in one fell swoop."
Sarah: "Perfect!"

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One clean fell swoop

When 5 or more employees of the same company are being fired simultaneously on Zoom.

At better.com the CEO recently had no time to call his employees into his office . He chose to perform the one clean fell swoop treatment on 900 employees.