lay to rest

Collins Cobuild//

lay (someone) to rest: bury (a dead person)

14. PHRASE : V inflects.

If you say that someone who has died is laid to rest, you mean that they are buried.

• His dying wish was to be laid to rest at the church near his Somerset home.
  

15. PHRASE : V inflects.

If you lay something such as fears or rumours to rest or if you put them to rest, you succeed in proving that they are not true.

• His speech should lay those fears to rest.