Slipped

The pencil slipped from the desk onto the floor.

The spy slipped the secret code into the message, without anyone realizing it.

The secret plan was slipped into a confidential memo, without anyone noticing.

He slipped on the wet pavement and sprained his ankle.

He slipped on the banana peel and landed on his backside.

She slipped on the icy sidewalk and slid several feet before coming to a stop.

She slipped and made an error in her calculations, resulting in an incorrect answer.

The spy slipped past the guard and entered the building undetected.