Lay/put something to rest
Definition 1 of 2
Pro Tip 1/3Metaphorical Closure
Used metaphorically to indicate the end of worry or debate. 
Once the misunderstanding was cleared, they could lay the dispute to rest.
Pro Tip 2/3Resolution
It suggests a definitive end to concerns or issues. 
The CEO's announcement put the rumors about bankruptcy to rest.
Pro Tip 3/3Connotation of Peace
Conveys a sense of peace after resolving something stressful. 
Finishing the project allowed us to lay our worries to rest.