seal, to seal

Definition

To seal an object means to keep it closed with something that makes it impossible to open without breaking the seal.

Often a seal is marked with a design to show who it belongs to.
Melted wax was used to seal letters or other documents that needed to be protected. When the wax cooled and hardened, the letter could not be opened without breaking the wax seal.
Some kind of seal was put on the stone in front of Jesus' grave in order to keep anyone from moving the stone.
Paul refers to the Holy Spirit as a seal that shows that our salvation is secure.