lifeline Meaning in the Cambridge Learner’s Dictionary
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Meaning of “lifeline” - Learner’s Dictionary

lifeline

noun [C]
 
 
/ˈlaɪflaɪn/
something that helps you when you are in a difficult or dangerous situation: For a lot of old people who live on their own, the telephone is a lifeline.Essential or necessary
(Definition of lifeline from the Cambridge Learner’s Dictionary © Cambridge University Press)
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