v.1. To remove something from some place gradually, easily, or without being noticed: I opened the bag and slipped out two pieces of chocolate. The thief slipped the wallet out of my pocket. I grabbed the keys and slipped them out the window.
2. To leave or become removed from some place gradually, easily, or without being noticed: The cotter pin slipped out and the trailer rolled away. The fish slipped out of my hands. The thief slipped out the door and into the alley.
3. slip out of To remove some clothing quickly or easily: I slipped out of my boots and put on my nice shoes.