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.

The bag slipped off her shoulder and spilled its contents onto the sidewalk.

The building's safety standards have slipped over the years due to lack of maintenance.

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