Английский Этимологический словарь - slip (n.)

- "narrow strip," 1440, probably from M.L.G. or M.Du. slippe "cut, slit," possibly related to O.E. toslifan "to split, cleave." Sense of "sprig for planting" first recorded in 1495; that of "young slender person" (a slip of a girl) in 1582; that of "narrow piece of paper" (pink slip) in 1687. The meaning "potter's clay" is from O.E. slyppe "slime," related to slupan "to slip."