Slipped

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

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

He slipped the key into the lock and turned it quietly.

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

He slipped the ring from his finger and into the box.

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.