Slipped

He slipped the pen off the desk and into his pocket.

He slipped on the wet steps and tumbled down the stairs.

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

She slipped on the rug and nearly fell down the stairs.

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

She slipped up and revealed the surprise party to the birthday boy.

He slipped into his pajamas and crawled into bed.

She slipped on the wet spot in the kitchen and dropped the dishes she was carrying.

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