Slipped

The book slipped from his lap and onto the floor.

The sun slipped below the horizon, leaving a colorful sky behind.

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

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

The package slipped from the delivery driver's hands and tumbled down the steps.

The temperature slipped down as the sun began to set.

The wind slipped in intensity as the storm passed by.

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