life·line

[lahyf-lahyn]
noun
1.
a line, fired across a ship or boat, by means of which a hawser for a breeches buoy may be hauled aboard.
2.
a line or rope for saving life, as one attached to a lifeboat.
3.
any of various lines running above the decks, spars, etc., of a ship or boat to give sailors something to grasp when there is danger of falling or being washed away.
4.
a wire safety rope supported by stanchions along the edge of the deck of a yacht.
5.
the line by which a diver is lowered and raised.
6.
any of several anchored lines used by swimmers for support.
7.
a route or means of transportation or communication for receiving or delivering food, medicine, or assistance: This road is the town's lifeline and must be kept open despite the snow.
8.
assistance at a critical time.

Origin:
1690–1700; life + line1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To lifeline
00:10
Lifeline is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
lifeline (ˈlaɪfˌlaɪn) [Click for IPA pronunciation guide]
 
n
1.  a line thrown or fired aboard a vessel for hauling in a hawser for a breeches buoy
2.  any rope or line attached to a vessel or trailed from it for the safety of passengers, crew, swimmers, etc
3.  a line by which a deep-sea diver is raised or lowered
4.  a vital line of access or communication

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
My guess is that it would take too long, requiring a lifeline or two, and only
  annoy the marketing types from each corporation.
In other words, the humanitarian lifeline is on the verge of snapping.
Unprecedented research and rescue efforts may offer a lifeline to species on
  the edge.
Lifeline is available on only one line per household.
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