fall down

pudota puhekieltä To fall to the ground. To collapse.

Ring a-ring o roses, / A pocketful of posies. / A-tishoo! A-tishoo! / We all fall down.'' — traditional nursery rhyme (British version)

The beams supporting the roof had rotted, causing the entire house to fall down.

Out of spite, the human beings pretended not to believe that it was Snowball who had destroyed the windmill: they said that it had fallen down because the walls were too thin.

That is where your reasoning falls down.