1. simple, straightforward good fortune or chance without any skill, planning, or effort involved
It was plain luck that I found my lost keys in the drawer.
Foi pura sorte que encontrei minhas chaves perdidas na gaveta.
2. mere coincidence or fortune, emphasizing the absence of design or strategy
Winning that prize was plain luck, nothing more.
Ganhar esse prêmio foi pura sorte, nada mais.