life·boat

[lahyf-boht]
noun
1.
a double-ended ship's boat, constructed, mounted, and provisioned so as to be readily able to rescue and maintain persons from a sinking vessel.
2.
a similarly constructed boat used by shore-based rescue services.

Origin:
1795–1805; life + boat

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
lifeboat (ˈlaɪfˌbəʊt) [Click for IPA pronunciation guide]
 
n
1.  a boat, propelled by oars or a motor, used for rescuing people at sea, escaping from a sinking ship, etc
2.  informal a fund set up by the dealers in a market to rescue any member who may become insolvent as a result of a collapse in market prices

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Lifeboat is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
the offspring of a zebra and a donkey.
Encyclopedia Britannica
Encyclopedia

lifeboat

watercraft especially built for rescue missions. There are two types, the relatively simple versions carried on board ships and the larger, more complex craft based on shore. Modern shore-based lifeboats are generally about 40-50 feet (12-15 metres) long and are designed to stay afloat under severe sea conditions. Sturdiness of construction, self-righting ability, reserve buoyancy, and manoeuvrability in surf, especially in reversing direction, are prime characteristics

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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