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Definition of lifeline
1a rope or line used for life-saving, typically one thrown to rescue someone in difficulties in water or one used by sailors to secure themselves to a boat. a line used by a diver for sending signals to the surface. 2a thing on which someone or something depends or which provides a means of escape from a difficult situation:fertility treatment can seem like a lifeline to childless couples 3(in palmistry) a line on the palm of a person’s hand, regarded as indicating how long they will live.