Say exactly a right thing. Answer to a question in exactly the right way. Be exactly right about something.
If you say someone has hit the nail on the head, you mean he/she
has answered to a question or described something in exactly the right way.
She hit the nail on the head when she proposed her plan at the last
meeting. It's exactly the thing we need to do now!
A: I think education is the most important thing we need to work on if we want
to make this city a better place.
B: You've hit the nail on the head! I completely agree with you!

This picture was electronically drawn by Erika Aoyama
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Last modified on April 26, 2002