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n. 慎重,谨慎 

拆分: dis-分离,分开 + -cret-区分 + -ion名词词尾 ⇒ 分得清什么该做什么不该做 ⇒ 慎重,谨慎。

短语:
at sb.’s discretion 由某人斟酌决定;随某人支配 
at the discretion of 随…的意见 
Discretion is the better part of valour 谨慎即大勇。 

例:
There is no service charge and tipping is at your discretion. 不收服务费，给不给小费您看着办。 
This case should be settled at the discretion of the court. 此案该由法院裁定。 
I'll be the soul of discretion. 我会非常谨慎。