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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. a rope that is thrown to someone who is in the water, especially the sea, and is in danger
(Definition of lifeline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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