1. What does it mean?
사축 combines company with livestock, through Japanese workplace slang. It describes feeling as though one's life belongs to the employer, with excessive obedience or work crowding out personal time.
Also written or said as sachuk
2. The nuance
It is dehumanizing if imposed on someone else. Self-directed use usually conveys frustration or dark humor, not pride in exploitation or a literal employment status.
3. Examples
“주말까지 일하니 사축이 된 기분이야.”
Working through the weekend makes me feel like I belong to the company.
“사축처럼 살고 싶지 않아서 퇴근 후 시간을 지키려 해.”
I don't want work to consume my life, so I try to protect my time after work.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.