mettre dans le mille
At last, you've hit the nail on the head!
Enfin, tu as mis le doigt dessus !
You've hit the nail on the head!
Tu as mis dans le mille !
Have I hit the nail on the head?
Ai-je vu juste ?
Sometimes you really hit the nail on the head.
Parfois, vous avez vraiment vu juste.
— Seven Samurai (1954)