Slipped

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

He slipped on the oil spill in the garage and got his hands dirty.

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

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

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

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

She slipped her feet into the high-heeled shoes, feeling confident and elegant.

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