come forward

动词 come forward:

1. make oneself visible; take action
   同义词：come to the fore, step forward, step up, step to the fore, come out

1. No one has come forward with information about the murder.
   没有一个人站出来提供有关谋杀的情况。
2. Police have appealed for witnesses to come forward.
   警方呼吁目击者挺身而出。
3. Many activists have come forward.
   涌现了大批积极分子。