A particular crease in the palm.
A line from the diver to a tender at the surface control point.
A line to which a drowning or falling victim may cling.
A means or route for transporting indispensable supplies.
System or structure of vital importance to a community.
A source of salvation in a crisis.
On the deck of a boat, a line to which one can attach oneself to stay aboard on rough seas.
A line on the palm of the hand, curving about the base of the thumb, supposed to indicate, by its form or position, the length of a person's life.