If you describe a rush or dash as headlong you mean that it is very quick.
the headlong rush to independence.
寻求独立的轻率举动。
If you move headlong in a particular direction, you move there very quickly.
He ran headlong for the open door.
他向那扇敞开的门猛冲过去。
If you fall or move headlong, you fall or move with your head furthest forward.
She missed her footing and fell headlong down the stairs.
她一脚踩空,头朝前摔下了楼梯。
If you rush headlong into something, you do it quickly without thinking carefully about it.
Do not leap headlong into decisions.
不要轻率地做决定。