1. Success or a favorable outcome that occurs by pure chance without skill, planning, or foresight
It was pure blind luck that I found my keys in the last place I looked.
Foi pura sorte cega que encontrei minhas chaves no último lugar que procurei.
2. An outcome that cannot be attributed to any deliberate action or merit
He won the lottery by blind luck, not because of any strategy.
Ele ganhou a loteria por sorte cega, não por estratégia alguma.