What does 2 Kings 11:2 mean?

But Jehosheba, King Joram's daughter and Ahaziah's sister, secretly took Ahaziah's son Joash and hid him away from the others who were being killed. She kept him and his nurse safe in a bedroom, so Athaliah never found him. 2 Kings 11:2 - Modern Text Bible

(Jehosheba risks her life to save her nephew Joash, hiding him from Athaliah's purge. Her courage preserves the royal line.)