The difference between Reinforce and Strengthen
When used as verbs, reinforce means to strengthen, especially by addition or augmentation, whereas strengthen means to make strong or stronger.
check bellow for the other definitions of Reinforce and Strengthen
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Reinforce as a verb (transitive):
To strengthen, especially by addition or augmentation.
Examples:
"He reinforced the handle with a metal rod and a bit of tape."
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Reinforce as a verb (transitive):
To emphasize or review.
Examples:
"The right homework will reinforce and complement the lesson!"
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Reinforce as a verb (transitive):
To encourage (a behavior or idea) through repeated stimulus.
Examples:
"Advertising for fast food can reinforce unhealthy dietary tendencies."
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Strengthen as a verb (transitive):
To make strong or stronger; to add strength to; to increase the strength of; to fortify; to reinforce.
Examples:
"to strengthen a limb, a bridge, an army;  to strengthen an obligation; to strengthen authority"
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Strengthen as a verb (transitive):
To animate; to give moral strength to; to encourage; to fix in resolution; to hearten.
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Strengthen as a verb (transitive):
To augment; to improve; to intensify.
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Strengthen as a verb (intransitive):
To grow strong or stronger.