upaść

Etymology 1
, from. .

Verb

 * 1)  to fall, to drop
 * 2)  to fall down, to abruptly deteriorate

Usage notes
This verb is used for heavy or solid objects that make a sound when touching the ground. For instance, miecz upadł na ziemię is correct, but for light objects such as feathers or leaves, the verbs or  would be used instead: Pióro spadło na ziemę and Liście opadły na ziemię.

Etymology 2
From.

Verb

 * 1)  to complete fattening an animal so that it is ready for slaughter
 * 2)  to get fattened for slaughter
 * 3)  to gain weight, to run to fat