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strengthen verb

  /ˈstɹɛnθən/ , /ˈstɹɛŋ(k)θən/ , /ˈʃt͡ʃɹeɪŋ(k)θən/
  • (transitive) To make strong or stronger; to add strength to; to increase the strength of; to fortify.
 stärka, förstärka
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