潰(つい)えるto fall apart, to collapse, to become useless, to be completely defeated (in battle), to be wiped out, to fall apart (one's body or health)

る-verb, Intransitive verb

1. 1.

   to collapse (of a building, dream, plan, etc.), to be destroyed, to fall through, to break down

2. 2.

   to be completely defeated (in battle), to be wiped out, to be routed