At a stroke; all at once in a single action — something happening quickly or suddenly in one go (somewhat formal).
借金を一挙に返すのは難しい。
It is difficult to pay off debts all at once.
工場を増設して生産量を一挙に増やした。
By expanding the factory, they increased production at a stroke.
問題点を一挙に解決する案が出された。
A plan was proposed to resolve the problems all at once.