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  • con·cern verb (used with object)
    1.
    to relate to; be connected with; be of interest or importance to; affect: The water shortage concerns us all.
    2.
    to interest or engage (used reflexively or in the passive, often followed by with or in ): She concerns herself with every aspect of the business.
    3.
    to trouble, worry, or disquiet: I am concerned about his health.

    noun
    4.
    something that relates or pertains to a person; business; affair: Law is the concern of lawyers.
    5.
    a matter that engages a person's attention, interest, or care, or that affects a person's welfare or happiness: The party was no concern of his.
    6.
    worry, solicitude, or anxiety: to show concern for someone in trouble.
    7.
    important relation or bearing: This news is of concern to all of us.
    8.
    a commercial or manufacturing company or establishment: the headquarters of an insurance concern.

    As you can see, "concern" has many usages as a verb and a noun.
    Please try to explain for me which of these has you confused.

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