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strengthen verb

  /ˈstɹɛnθən/ , /ˈstɹɛŋ(k)θən/ , [ˈstɹeɪŋ(k)θən]
  • (transitive) To make strong or stronger; to add strength to; to increase the strength of; to fortify.
 уси́ливать, уси́лить

strengthening

усиление
strengthen bolster
укреплять
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