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English definition of “lifeline”

lifeline

noun [C]     /ˈlaɪf.laɪn/
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 danger Cords, ropes, cables and string
(Definition of lifeline noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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