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attenuate /əˈtɛnjəˌweɪt/  

Anh-Việt Anh-Anh
  • verb
    -ates; -ated; -ating
    [+ obj] formal :to make (something) weaker or less in amount, effect, or force
    Earplugs will attenuate the loud sounds of the machinery.
    an attenuated virus