- 及锋而试 jífēng'érshì to strike while the iron is hotTo take advantage of the right moment to act; to make use of an army while its morale is at its peak.
- 及锋一试 jífēngyīshì to strike while the iron is hot(variant form) to take advantage of an opportunity while the edge is sharp or the situation is favorable; to act while the time is right