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Noun lifeline has 4 senses
  1. line of life, life line, lifeline - a crease on the palm; its length is said by palmists to indicate how long you will live
    --1 is a kind of wrinkle, furrow, crease, crinkle, seam, line
  2. lifeline - 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"
    --2 is a kind of
    support; connection, link, connectedness
  3. lifeline - line that raises or lowers a deep-sea diver
    --3 is a kind of
  4. lifeline - line thrown from a vessel that people can cling to in order to save themselves from drowning
    --4 is a kind of
    --4 has particulars: ridge rope
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