'lifeline' definitions:

Definition of 'lifeline'

(from WordNet)
noun
A crease on the palm; its length is said by palmists to indicate how long you will live [syn: line of life, life line, lifeline]
noun
Support that enables people to survive or to continue doing something (often by providing an essential connection); "the airlift provided a lifeline for Berlin"; "she offered me a lifeline in my time of grief"
noun
Line that raises or lowers a deep-sea diver
noun
Line thrown from a vessel that people can cling to in order to save themselves from drowning

Definition of 'lifeline'

From: GCIDE
  • lifeline \lifeline\ n.
  • 1. The anem given to one of the creases on the palm; its length is said by palmists to indicate how long one will live.
  • Syn: line of life, life line. [WordNet 1.5]
  • 2. A line or rope which raises or lowers a deep-sea diver. [WordNet 1.5]
  • 3. A line from a vessel that people in a body of water can cling to to save themselves from drowning. [WordNet 1.5]

Synonyms of 'lifeline'

From: Moby Thesaurus