hot·line

[hot-lahyn]
noun
1.
hot line.
adjective
2.
Chiefly Canadian. of or pertaining to a radio program that receives telephone calls from listeners on the air.
Origin:
1950–55; hot + line1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
hotline (ˈhɒtˌlaɪn) [Click for IPA pronunciation guide]
 
—n
1.  a direct telephone, teletype, or other communications link between heads of government, for emergency use
2.  any such direct line kept for urgent use

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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00:10
Hotline is always a great word to know.
So is doohickey. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a gadget; dingus; thingumbob.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
FOLDOC
Computing Dictionary

Hotline definition


1. Hotline Communications Ltd..
2. Hotline Connect.
(1999-12-07)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The number posted on fliers at drug treatment centers isn't for a typical
  hotline.
But the two sides are now talking about setting up a military hotline.
Shortly thereafter, it established a public hotline to answer veterans'
  inquiries about the status of their personal information.
If you are concerned about yourself or about somebody else, call the crisis
  hotline.
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