Definition of "lifeline" in English

noun

1. A line to which a drowning or falling victim may cling.

2. (by extension) A source of salvation in a crisis.

3. A means or route for transporting indispensable supplies.

4. (engineering) A system or structure of vital importance to a community.

5. (nautical) On the deck of a boat, a line to which one can attach oneself to stay aboard on rough seas.

6. (underwater diving) A line from the diver to a tender at the surface control point.

7. (palmistry) A particular crease in the palm.