One's superior or boss at work—the person in a higher position, such as a manager or supervisor.
上司に報告する前に、資料をもう一度確認した。
I checked the materials once more before reporting to my boss.
あの上司は部下の意見をよく聞いてくれる。
That boss listens well to subordinates' opinions.
昇進して念願の上司になった。
I was promoted and became the long-desired boss.