I was relieved to hear that they'd arrived safely.
A load off your mind
Knowing that the problem can be fixed — it's such a load off my mind.
Heave a sigh of relief
Everyone in class heaved a sigh of relief after that horrible midterm exam was over.
She sighed deeply and sat down.
Load n. 负重，载重
The maximum load for this elevator is eight persons.
A load of 许多，大量
I've got a load of work to get through before tomorrow.