1. swoop
Five people were apprehended during the police swoop
Starlings appear in the sky in big black clouds that swoop, dance and dive.
The hawk swooped down on its prey.
Gems haul seized in swoop
... phone in one fell swoop.
This is a golden opportunity we'd be stupid to pass up. Let's get to work and finish it all in one fell swoop.
2. swoop in
it's time for us to swoop in.
The police should swoop in at once