The term slip can have several meanings depending on its context.
1) In a general sense, it refers to an error or mistake made unintentionally. For example, "I made a slip and forgot my wallet at home."
2) It can also refer to a piece of paper or fabric that is used for writing or wiping. For instance, "Please take out the message from its slip case before reading it."
3) In clothing, particularly in women's wear, a slip refers to an undergarment worn beneath another garment to prevent it from slipping or sliding. It is usually made of silk, nylon or other smooth fabrics and comes in various styles such as full-length, half-sleeve, short sleeves etc.
4) In the context of transportation, a slip refers to the movement of an object sideways along an inclined plane. For example, "The car skidded on the icy road and went into a slip."