Longman Dictionary of Contemporary English homepage

lifeline

 noun
     
Related topics: Water
life‧line [countable]
1 something which someone depends on completely
lifeline to
The telephone is her lifeline to the rest of the world.
lifeline for
The organization has proved to be a lifeline for thousands of needy families.
2TTW a rope used for saving people in danger, especially at sea
Definition from the Longman Dictionary of Contemporary English
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