yī gǔ zuò qì
Meaning: Finish your work in one go; (Lit. the first drum in combat can provoke a warrior's spirit.)
For example, 一鼓作气做事情 means 一口气把工作做完。
Original: “全党四场专题教育，习近平要一鼓作气抓什么？ ”
appears in an infographic recapping Xi Jinping's "Four Educations for the Whole Party" that will be implemented in June.