at a (single) stroke
US /æt ə ˈsɪŋɡəl stroʊk/
UK /æt ə ˈsɪŋɡəl stroʊk/

1.
in un colpo solo, di colpo
with a single action or effort; all at once
:
•
He solved all the problems at a single stroke.
Ha risolto tutti i problemi in un solo colpo.
•
The new policy changed everything at a stroke.
La nuova politica ha cambiato tutto in un colpo solo.