Lay somebody to rest
Definition 1 of 2
Pro Tip 1/3Funeral Context
Use 'lay somebody to rest' when referring to burial procedures as part of a funeral. 
After the funeral service, we will lay her to rest beside her husband.
Pro Tip 2/3Respect and Sympathy
This phrase is gentle and shows respect. Use it to express sympathy for the deceased. 
He was a good man, and we are here to lay him to rest with dignity.
Pro Tip 3/3Metaphorical Use
Can be used metaphorically for ending things other than life, like retiring a ship. 
The old ship was finally laid to rest after years of service at sea.