be bent on doing something 处心积虑

“处心积虑”，汉语成语，形容蓄谋已久，千方百计的算计。可以翻译为“be bent on doing something或nurture schemes for a chance”等。

例句：

这件事是处心积虑、早有预谋的。

It was both deliberate and malicious.

处心积虑想搞垮对手

Intrigue against one's rival