weak·en

[wee-kuhn]
verb (used with object)
1.
to make weak or weaker.
2.
Phonetics. to change (a speech sound) to an articulation requiring less effort, as from geminate to nongeminate or from stop to fricative.
verb (used without object)
3.
to become weak or weaker.

Origin:
1520–30; weak + -en1

weak·en·er, noun
re·weak·en, verb
un·weak·ened, adjective
un·weak·en·ing, adjective


1, 3. enfeeble, debilitate, enervate, undermine, sap, exhaust, deplete, lessen, diminish, lower, reduce, impair, minimize, invalidate.


1, 3. strengthen.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To weaken
00:10
Weaken is always a great word to know.
So is surd. Does it mean:
a vowel or a voiced consonant or semivowel that is neither a stop nor an affricate
voiceless; opposite to sonant
Collins
World English Dictionary
weaken (ˈwiːkən) [Click for IPA pronunciation guide]
 
vb
to become or cause to become weak or weaker
 
'weakener
 
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
Cite This Source
Example sentences
Fossils weaken the strength of cut stone and many people discard them outright.
They weaken the bird's eggshells and severely limited their ability to
  reproduce.
Domestically, her position may also weaken if her reforms disappoint or upset
  voters-as this week's health-care plans may do.
Chemotherapy causes your immune system to weaken, so you should avoid people
  with colds or the flu.
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