o·ver·re·act

[oh-ver-ree-akt]
verb (used without object)
to react or respond more strongly than is necessary or appropriate.

Origin:
1960–65; over- + react

o·ver·re·ac·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
overreact (ˌəʊvərɪˈækt) [Click for IPA pronunciation guide]
 
vb
(intr) to react excessively to something
 
overre'action
 
n

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
Overreact is one of our favorite verbs.
So is bowdlerise. Does it mean:
to swindle, cheat, hoodwink, or hoax.
to expurgate (a written work) by removing or modifying passages considered vulgar or objectionable.
Etymonline
Word Origin & History

overreact
1961, from over + react. Related: Overreacting.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

overreact o·ver·re·act (ō'vər-rē-ākt')
v. o·ver·re·act·ed, o·ver·re·act·ing, o·ver·re·acts
To react with unnecessary or inappropriate force, emotional display, or violence.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Histamine is one of the chemicals released when antibodies overreact to
  allergens.
Don't overreact to moodiness and exaggerated positions.
Noise traders generally have poor timing, follow trends, and overreact to good
  and bad news in the market.
People often overreact to such situations because of a surge of adrenaline.
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