in one fell swoop
US /ɪn wʌn fɛl swuːp/
UK /ɪn wʌn fɛl swuːp/

1.
in un colpo solo, tutto in una volta
all at once; in a single action or event
:
•
He lost all his money in one fell swoop.
Ha perso tutti i suoi soldi in un colpo solo.
•
The new policy addressed several issues in one fell swoop.
La nuova politica ha affrontato diverse questioni in un colpo solo.