tomber en rideau

Le rideau tombe

The curtain falls.

Quand j'ai venu le matin à mon bureau, j'ai trouvé le rideau tombé par terre

When I came to my office in the morning, I found the curtain dropped

Quelques années plus tard, le rideau de fer tombait.

When they became aware that that transition was possible, they concluded that the transition was complete and that they had already arrived at communism.

le rideau de la fenêtre est tombé par terre

the window curtain is dropped