Slipped

The book slipped from his lap and onto the floor.

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

He slipped and used a curse word in front of his grandmother.

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

He slipped into his pajamas and crawled into bed.

The bird slipped out of its cage and flew away.

The crowd's noise slipped to a murmur as the speaker took the stage.

The mouse slipped through the small crack in the wall.

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