lifeline

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a crease on the palm; its length is said by palmists to indicate how long you will live
noun support that enables people to survive or to continue doing something (often by providing an essential connection)
noun line that raises or lowers a deep-sea diver

From life + line.

He therefore gave a pull to the lifeline. — Under the Waves: Diving in Deep Waters, R. M. (Robert Michael) Ballantyne
Intelligent computers are Japan's lifeline--the "steam engine" of the next century. — The Samurai Strategy, Thomas Hoover
A cloud of hair came falling about the slim shoulders as the speaker bent to pass this strange lifeline to Smith; and I think it was my wonder at knowing her for the girl whom that day I had surprised in Cadby's rooms which saved my life. — The Insidious Dr. Fu Manchu, Sax Rohmer

line of life, life line

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