weaken

[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

weakener, noun
reweaken, verb
unweakened, adjective
unweakening, adjective


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


1, 3. strengthen.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To weaken
Collins
World English Dictionary
weaken (ˈwiːkən)
 
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
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Example sentences
Fossils weaken the strength of cut stone and many people discard them outright.
It is clear that the ones behind it work by an agenda, in order to strengthen
  certain beliefs and weaken others.
Or, you may be viewed as a political liability who will rally opposition and
  weaken the appointee's leadership and effectiveness.
How the layers bond often determines how easily one will weaken and cause a
  slide.
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