Main Entry: life·line

Pronunciation: \ˈlīf-ˌlīn\

Function: noun

Date: 1700

1 : a line (as a rope) used for saving or preserving life: as a : a line along the outer edge of the deck of a boat or ship b : a line used to keep contact with a person (as a diver or astronaut) in a dangerous or potentially dangerous situation
2 : something regarded as indispensable for the maintaining or protection of life