Correct
枕戈待旦
/ zhěn gē dāi dàn /
Strokes
Definition
to wait for dawn, one's head resting on a spear (idiom)/fully prepared and biding one's time before the battle
Example
Definition
lie with one's head pillowed on a spear/pillow one's head on a spear, waiting for day to break; make a pillow of one's spear waiting for daybreak; rest on firearms as pillows till dawn—be ready for battle; maintain combat readiness; all set to start the battle; be on 24-hour standby; keep vigil/be ready for an emergency; be on the alert at all hours