a load off my mind 心头大石落地；心头大石放下

【例句】
You are finally admitted to a good university， it's really a load off my mind.
你终于上了一所好大学，那可真是让我去了心头一块大石头。

It is a load off my mind finally to learn today from your wife that you had a successful operation.
听说您的手术很顺利，我心中的一块石头真正落了地。