This is the 10130th most frequent Japanese word.
酷使
Excessive use or exploitation.
The word '酷使' is used to describe excessive exertion or overutilization of one's body in a context of hard work.
彼は体を酷使して働いています。
He is overworking his body.
In this context, '酷使' refers to overusing the mechanical device beyond reasonable limits.
この機械を酷使しすぎると故障してしまうかもしれません。
If we overuse this machine, it might break down.
Here, '酷使' signifies the intense application of one's intellectual resources or capabilities.