lifeline

Meanings

1. A line to which a drowning or falling victim may cling.
2. A source of salvation in a crisis.
3. A means or route for transporting indispensable supplies.
4. A system or structure of vital importance to a community.
5. On the deck of a boat, a line to which one can attach oneself to stay aboard on rough seas.
6. A line from the diver to a tender at the surface control point.
7. A particular crease in the palm.

Etymology

From life + line.