How do you use the verb ground in a sentence?

It usually means the past tense of grind.

Example: He ground the spices into a powder

It can also mean at peace, or in a place mentally where one can collect their thoughts and feel connected to the world.

Example: She felt most grounded when she was in the woods surrounded by birds and nature.

It may also mean a way to keep lightning or electricity from shocking anything or sparking anything, usually by removing charges in something.

Example: Lightning rods are grounded so the energy wont overwhelm anything.

The above definition is derived from this.