こき使つかう

godan verb (-u), transitive verb

work hard; push around; exploit

To make someone work excessively hard, often in a harsh or exploitative manner. Conveys a sense of driving someone relentlessly.

• 上じょう司しは部ぶ下かをこき使つかっている。

  The boss works his subordinates hard.

• あの会かい社しゃは社しゃ員いんをこき使つかうことで有ゆう名めいだ。

  That company is notorious for exploiting its employees.