Basic Guidelines For English Spellings
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See US English definition of strengthen
See UK English definition of strengthen
See Spanish definition of fortalecer
1‘calcium helps strengthen growing bones’
weaken
2‘engineers strengthened the walls’
3‘strengthened glass’
4‘the wind had strengthened’
die down, ease off
5‘his insistence strengthened her determination’
sap, weaken
6‘the organization strengthened its efforts to expand such programmes’
relax, decrease
7‘the argument is strengthened by evidence from clinical data’
undermine