1. (noun) line of life, life line, lifeline
a crease on the palm; its length is said by palmists to indicate how long you will live
Synonyms: life line, lifeline, line of life
2. (noun) lifeline
support that enables people to survive or to continue doing something (often by providing an essential connection)
Synonyms: life line, line of life
3. (noun) lifeline
line that raises or lowers a deep-sea diver
Synonyms: life line, line of life
4. (noun) lifeline
line thrown from a vessel that people can cling to in order to save themselves from drowning
Synonyms: life line, line of life
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Synonyms for lifeline 
