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What is another word for lifeline?

What's another word for lifeline? | Here's a list of synonyms for lifeline.

Definition 1: line thrown from a vessel that people can cling to in order to save themselves from drowning - [noun denoting artifact]

Definition 1: line that raises or lowers a deep-sea diver - [noun denoting artifact]

Definition 1: support that enables people to survive or to continue doing something (often by providing an essential connection) - [noun denoting cognition]

Definition 1: a crease on the palm; its length is said by palmists to indicate how long you will live - [noun denoting shape]