at a (single) stroke

US /æt ə ˈsɪŋɡəl stroʊk/
UK /æt ə ˈsɪŋɡəl stroʊk/
"at a (single) stroke" picture
1.

一举, 一下子

with a single action or effort; all at once

:
He solved all the problems at a single stroke.
一举解决了所有问题。
The new policy changed everything at a stroke.
新政策一下子改变了一切。