fell down

Verb

fall down (third-person singular simple present falls down, present participle falling down, simple past fell down, past participle fallen down)

1. (intransitive) 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)

   Synonyms:

   drop, fall, collapse

2. To sail or drift toward the mouth of a river or other outlet.
3. (figuratively, intransitive) To fail; to make a mistake.
   • That is where your reasoning falls down.