ENGLISH
REFERENCE

concerning

prep. · adj.
US //kənˈsɝnɪŋ// UK //kənsˈɜːnɪŋ// con·cern·ing
  1. 1 about or regarding (prep.)
    B1 Intermediate Formal

    about or relating to a particular subject.

    regarding or relating to; used as a formal preposition to introduce a topic.

    Example

    The lawyer asked several questions concerning the events of last night.

    Example

    The board of directors issued a formal statement concerning the proposed merger and its potential impact on long-term shareholders.

    Usage

    Often used in professional or academic writing to replace the more common 'about'.
  2. 2 worrying (adj.)
    B2 Upper Intermediate

    making you feel worried or anxious.

    causing concern, anxiety, or apprehension; often used to describe a trend or piece of news.

    Example

    The doctor said the test results were quite concerning and ordered more scans.

    Example

    The recent decline in local biodiversity is deeply concerning to environmental scientists who have been monitoring the region for decades.
Origin

From concern + -ing. The adjective and preposition follow from the verb.

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