a rope or line used for life-saving, typically one thrown to rescue someone in difficulties in water or one used by sailors to secure themselves to a boat.
a line used by a diver for sending signals to the surface.
a thing that is essential for the continued existence of someone or something or that provides a means of escape from a difficult situation:
fertility treatment can seem like a lifeline to childless couples.
(in palmistry) a line on the palm of a person's hand, regarded as indicating how long they will live.
throw a lifeline to
(or throw someone a lifeline)
provide (someone) with a means of escaping from a difficult situation.
•catchline • dragline • tramline
•landline • strapline • chatline
, deadline, headline, redline
•neckline • hemline • helpline
•saline • mainline
, bassline, waistline
, feline, treeline
•streamline • slimline • sibylline
•Adeline • bodyline • storyline
, sideline, tideline
•lifeline • pipeline • sight line • hotline
, Pauline, shoreline
•coastline • clothesline • microcline
•Fräulein • Ursuline • touchline
•bloodline • plumb line • punchline
•buntline • timberline • borderline
•underline • alkaline • opaline
•Caroline • coralline • crystalline
•waterline • landmine • carmine
•calamine • melamine