(intransitive) To fall to the ground. To collapse. / (nautical) To sail or drift toward the mouth of a river or other outlet. / (intransitive, figuratively) To fail.

To fail at or leave incomplete. / To prostrate oneself in a position that rests on / To collapse so that the remains are on top of. / To stumble or unintentionally descend and land on

Third-person singular simple present indicative form of fall down

present participle of fall down