Slipped

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.

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

The thief slipped the stolen goods into his backpack and walked out of the store.

I slipped up and forgot to send the important email.

The thief slipped away with the purse before anyone noticed.

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

The quality of the product slipped after the company outsourced production.