managing director
US /ˈmæn.ɪ.dʒɪŋ dɪˈrek.tər/
UK /ˈmæn.ɪ.dʒɪŋ dɪˈrek.tər/

1.
the executive director responsible for the day-to-day operation of a company or organization
:
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The managing director announced the company's new strategy.
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She was promoted to managing director last year.