1. a person who calls a hotline, especially to report information or seek help
Usage: informal
2. a telephone hotline or the service that operates it
Usage: informal; chiefly North American

Examples

• The crime hotliner provided police with a crucial tip about the suspect.
• Many hotliners called the mental health crisis line seeking support.
• The news station set up a hotliner for viewers to report traffic accidents.
• Hotliners can remain anonymous when reporting information to the tip line.
• The organization trained staff to handle calls from hotliners during the emergency.