Definitions of slip:

• noun:   the act of avoiding capture (especially by cunning)
• noun:   a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.
• noun:   a flight maneuver; aircraft slides sideways in the air
• noun:   a small sheet of paper

  Example: "A receipt slip"

• noun:   an accidental misstep threatening (or causing) a fall

  Example: "He blamed his slip on the ice"

• noun:   a young and slender person

  Example: "He's a mere slip of a lad"

• noun:   potter's clay that is thinned and used for coating or decorating ceramics
• noun:   an unexpected slide
• noun:   artifact consisting of a narrow flat piece of material
• noun:   a part (sometimes a root or leaf or bud) removed from a plant to propagate a new plant through rooting or grafting
• noun:   bed linen consisting of a cover for a pillow
• noun:   a socially awkward or tactless act
• noun:   a woman's sleeveless undergarment
• noun:   a slippery smoothness
• noun:   a place where a craft can be made fast
• verb:   move smoothly and easily
• verb:   pass on stealthily

  Example: "He slipped me the key when nobody was looking"

• verb:   pass out of one's memory
• verb:   insert inconspicuously or quickly or quietly

  Example: "He slipped some money into the waiter's hand"

• verb:   get worse

  Example: "My grades are slipping"

• verb:   move obliquely or sideways, usually in an uncontrolled manner
• verb:   move stealthily

  Example: "The ship slipped away in the darkness"

• verb:   to make a mistake or be incorrect
• verb:   move out of position