Hit the nail on the head
The idiom “hit the nail on the head” means to describe when someone has made a precise or accurate statement or identified the core issue of a situation correctly. It suggests that the person has pinpointed the exact problem or solution with great accuracy, just like hitting a nail directly on its head with a hammer. When someone uses this idiom, they are acknowledging that the other person has articulated or understood something perfectly without any room for error. It implies that the individual has not only grasped the main point but has also expressed it in a clear and concise manner.
If a friend is trying to explain a complex issue, and you respond by summarizing it succinctly and accurately, your friend might say, “You really hit the nail on the head!” This means that you have precisely captured the essence of the matter.