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English definition of “lifeline”

lifeline

noun [C] uk   /ˈlaɪf.laɪn/ us  
something, especially a way of getting help on that you depend on to lead your life in a satisfactory way: For many old people living on their own the phone is their lifeline to the outside world.Essential or necessary a rope that is thrown to someone who is in the water, especially the sea, and is in dangerCords, ropes, cables and string
(Definition of lifeline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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