1. The first attempt or initial exertion made to accomplish a task or achieve a goal
The team's opening effort in the first quarter set the tone for the entire game.
O esforço inicial do time no primeiro quarto estabeleceu o tom para o jogo inteiro.
2. An initial move or action taken to begin a process, project, or competition
Their opening effort to negotiate a peace treaty showed genuine commitment.
Seu esforço inicial para negociar um tratado de paz demonstrou comprometimento genuíno.