[strengk-thuhn, streng-, stren-]
verb (used with object)
to make stronger; give strength to.
Phonetics. to change (a speech sound) to an articulation requiring more effort, as from fricative to stop or nongeminate to geminate.
verb (used without object)
to gain strength; grow stronger.

1250–1300; Middle English strengthnen. See strength, -en1

strengthener, noun
strengtheningly, adverb
overstrengthen, verb
prestrengthen, verb (used with object)
restrengthen, verb
unstrengthened, adjective
unstrengthening, adjective

1. buttress, reinforce, fortify, support. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To strengthen
World English Dictionary
strengthen (ˈstrɛŋθən)
to make or become stronger

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
Financial stress can strengthen relationships, if it is dealt with.
Introduces, facilitates, and manages improvements and modifications to
  strengthen program and align with best practices.
To strengthen intra-college, community, and of district-wide staff relations.
Several emerging economies will reintroduce or strengthen controls on capital
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