[n. oh-ver-dohs; v. oh-ver-dohs, oh-ver-dohs]
noun, verb, overdosed, overdosing.

1680–90; over- + dose

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World English Dictionary
1.  (esp of drugs) an excessive dose
2.  to take an excessive dose or give an excessive dose to

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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Word Origin & History

1700 (n.), "an excessive dose," 1727 (v.), "to administer medicine in too large a dose" (trans.), from over + dose. Meaning "to take an overdose of drugs" is first attested 1973.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

overdose o·ver·dose (ō'vər-dōs')
An excessive dose, especially of a narcotic.

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
Yes, it was an overdose of disgusting food served at an interview dinner.
But our incidence of drug overdose deaths is way out of proportion to our
  population density.
Newspapers began reporting deaths resulting from overdose.
Fearing that she had taken an overdose, he hurried to her apartment.
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