The Baroness will say no more.
3 seconds sound clip from the Mr. Topaze (1961) movie soundboard.
You can hear this line at 00:37:38 in the Blu-ray version of the movie.
Quote context
[...]
- My grandson does not understand the problem because the whole thing is pre-arranged.
- The problem was a sort of labyrinth in which two workmen were digging a rectangular ditch.
- The Baroness will say no more.
- Madam, having made such an accusation, you must say more.
- Do you deny that there is a boy of the name of Gigon in your class?
- No, madam, I would not deny there is a boy of that name.
[...]