Slipped

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.

The papers slipped out of the folder and scattered across the desk.

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.

He slipped on the soap in the shower and grabbed onto the curtain to prevent falling.

The bird slipped out of its cage and flew away.

He slipped on the wet tiles and almost crashed into the wall.

The mouse slipped through the small crack in the wall.

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