to bring word to someone: to report what has happened or to announce a message, carrying it from its source to a listener
At its heart this verb pictures a messenger. Someone has seen, heard, or been handed something, and now they carry that word to another person. The English Bible usually translates it "told," "reported," "announced," or "declared," and all of those catch the same basic motion: word travels from one place to another and reaches an audience.
Most of the time the word is plain news. The herdsmen run to town and tell what happened to the pigs and the men possessed by demons. The women run from the empty tomb and tell the disciples. Officials and soldiers in Acts report back what they have found. Often the person carrying the word was sent or told to do so, so the same verb covers being instructed to "go and tell": the angel sends the women to bring word to the disciples, and the healed man is sent home to tell his household what God has done.
The second shade lifts the same act to a higher key. The thing brought is not just an event but a message worth proclaiming, and the one who brings it stands as an authorized witness. John declares the eternal life he has seen and heard; the new convert in Corinth falls down and announces that God is truly present; the chosen servant of Isaiah will announce justice to the nations. The motion is identical, telling another what one knows, but now it carries the weight of testimony and proclamation rather than mere news.