1. Third person singular present indicative of 'destruir' with reflexive pronoun 'se', expressing that something destroys itself or is destroyed (impersonal/passive construction)
The building destroys itself over time.
O edifício destrói-se com o tempo.
2. Impersonal/passive form indicating destruction without specifying the agent
Everything destroys itself in nature.
Tudo destrói-se na natureza.