1. a direct telephone line for immediate communication, especially for emergencies or urgent matters
2. a telephone service providing information, support, or assistance on specific topics

Examples

• The suicide prevention hotline is available 24 hours a day.
• She called the customer service hotline to report the problem.
• The crisis hotline received hundreds of calls during the emergency.
• A domestic violence hotline provides confidential support to victims.
• The company set up a hotline for product recalls.
• Students can call the academic support hotline for tutoring help.
• The poison control hotline gave immediate medical advice.