This is the 9450th most frequent Korean word.
겸직은
The Korean word "겸직은" refers to "holding multiple jobs or positions simultaneously."
In this sentence, '겸직은' explicitly refers to the act of holding multiple job responsibilities as a subject of the restriction.
회사의 정책상 겸직은 허락되지 않는다.
Under the company's policy, holding multiple positions is not allowed.
Here, '겸직은' signifies the dual responsibilities taken on and stresses how they contribute to his busy schedule.
그는 교수로서의 업무와 연구소 소장으로서의 겸직은 언제나 바쁘다.
His dual roles as a professor and head of the research institute always keep him busy.
Here, '겸직은' is a noun meaning 'holding multiple positions or jobs simultaneously,' and it's used to introduce the subject of the sentence, emphasizing its challenges.