(on someone or something) to return with information or an explanation from someone or something. I need you to report back on Walter by noon. I'll report back as soon as I can.
1. to go back to someone or something and present oneself. Report back to me at once! I'll report back immediately.
2. to present information or an explanation to someone or some group. Please report back to me when you have the proper information. I'll report back as soon as I have all the information.