a weight off your mind
a weight off (one's) mind
The relief felt after sharing what one is thinking or feeling with others, or upon no longer having a particular problem. Having a night out to talk over my problem with my close friend helped me get a weight off my mind. I finally completed my tax return for this year. That's a weight off my mind!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a weight off your mindor
a load off your mind
If you describe something as a weight off your mind or a load off your mind, you mean that a problem that you were previously worried about has now been solved and you are no longer anxious. It's a real weight off my mind, knowing I have a job to go to. Knowing that the problem can be fixed — it's such a load off my mind. Note: You can also say that something takes a weight off your mind or takes a load off your mind. It was such a relief to find a good school for the kids. It took a real weight off my mind.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012