1. something that provides essential support or assistance, especially in a difficult situation
2. a rope or line used for safety or rescue, especially on a ship or in dangerous conditions
Usage: nautical; safety equipment
3. a means of communication or connection that is vital for survival or operation

Examples

• The food bank became a lifeline for struggling families during the recession.
• Her weekly phone calls were a lifeline during his recovery from surgery.
• The climbers secured themselves with a lifeline before crossing the dangerous ridge.
• The ship’s crew threw a lifeline to the man overboard.
• The internet connection served as their lifeline to the outside world.
• Federal funding was a lifeline for the failing school district.
• The rescue team followed the lifeline back to safety through the cave.