成语 to hit the nail on the head 意思是“说中了问题的关键、切中要害”。
I think Jemma hit the nail on the head when she said that the management lacked inspiration.
Peter hit the nail on the head when he spoke out against bullying in the school.
另一个含有“nail 钉子”一词的成语是 nail something down，意思是把什么事情确定、敲定下来。
He's been looking at maps for weeks trying to nail down his route.
Could you nail down the meeting time and place for our presentation?