Definition of lifeline
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
Examples of lifeline in a sentence
The river is the town's lifeline.
The new jobs were an economic lifeline for a city in need of help.
The radio was their lifeline to the outside world.
They threw a lifeline to the man overboard.
First Known Use of lifeline
LIFELINE Defined for English Language Learners
Definition of lifeline for English Language Learners
: something which provides help or support that is needed for success or survival
: a rope used for saving the life of someone (such as someone who has fallen into water)
Learn More about lifeline
Seen and Heard
What made you want to look up lifeline? Please tell us where you read or heard it (including the quote, if possible).