on

To switch on

"Can you on the light?"

Similar: turn on

In the state of being active, functioning or operating.

"All the lights are on, so they must be home."

Performing according to schedule; taking place.

"Are we still on for tonight?"

Fitted; covering; being worn.

"I was trying to drink out of the bottle while the top was still on!"

To an operating state.

"turn the television on"

So as to cover or be fitted.

"Put on your hat and gloves."

Along, forwards (continuing an action).

"drive on, rock on"

Positioned at the upper surface of, touching from above.

"A vase of flowers stood on the table."

Positioned at or resting against the outer surface of; attached to.

"He had a scar on the side of his face."

Expressing figurative placement or attachment.

"All of the responsibility is on him."