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.

The water level slipped as the drought continued.

The bird slipped out of its cage and flew away.

The mouse slipped through the small crack in the wall.

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

His physical condition slipped after he stopped exercising.