false alarm

noun
1.
a false report of a fire in progress to a fire department.
2.
something that excites unfounded alarm or expectation: Rumors of an impending transit strike proved to be a false alarm.

Origin:
1570–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
false alarm
 
n
1.  a needless alarm given in error or with intent to deceive
2.  an occasion on which danger is perceived but fails to materialize

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
False alarm is always a great word to know.
So is quincunx. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
American Heritage
Idioms & Phrases

false alarm

A warning signal that is groundless, made either by mistake or as a deliberate deception. For example, The rumor that we were all going to get fired was just a false alarm, or Setting off a false alarm is a criminal offense. This expression, first recorded in 1579, today is often used for a report of a nonexistent fire.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Thank you for taking the first step in false alarm prevention.
After a false alarm which turned out to be a transmission from an aircraft, no
  signals of extraterrestrial origin were reported.
It was a false alarm, and service on all lines was restored by early afternoon.
If the home-loving citizen would sit down and think about it, he would realize
  that this is a false alarm.
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