strengthen Meaning in Cambridge American English Dictionary
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Meaning of "strengthen" - American English Dictionary

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strengthenverb [I/T]

 us   /ˈstreŋk·θən, ˈstreŋ-/

strengthen verb [I/T] (BECOME EFFECTIVE)

to become more effective, or to make something more effective: [T] Somehow his illness strengthened their marriage and brought them closer together. [T] Parents can strengthen ties with their children.

strengthen verb [I/T] (BECOME POWERFUL)

to become more powerful or more difficult to break, or to make something stronger: [T] If something isn’t done to strengthen the railroad bridge, it may collapse. [I] The tone of her voice strengthened suddenly. [T] Exercise will strengthen your legs.
(Definition of strengthen from the Cambridge Academic Content Dictionary © Cambridge University Press)
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