What does SLIP mean?

verb

1. move stealthily“The ship slipped away in the darkness”
2. insert inconspicuously or quickly or quietly“He slipped some money into the waiter's hand”
3. move obliquely or sideways, usually in an uncontrolled manner“the wheels skidded against the sidewalk”
4. get worse“My grades are slipping”
5. move smoothly and easily“the bolt slipped into place”
6. to make a mistake or be incorrect
7. pass on stealthily“He slipped me the key when nobody was looking”
8. move easily“slip into something comfortable”