decausativize

verb1

1. •
   To function in manner that is not causative (e.g. The causative verb "melt" in He melts the ice decausativizes in The ice melts).

   • Levin and Rappaport (1995) argue that causative verbs can decausativize when the eventualities described come about spontaneously without the external intervention of an agent. — 1998