Source : Webster's Revised Unabridged Dictionary (1913)

Slip \Slip\, v. i. [imp. & p. p. {Slipped}; p. pr. & vb. n.
   {Slipping}.] [OE. slippen; akin to LG. & D. slippen, MHG.
   slipfen (cf. Dan. slippe, Sw. slippa, Icel. sleppa), and fr.
   OE. slipen, AS. sl[=i]pan (in comp.), akin to G. schleifen to
   slide, glide, drag, whet, OHG. sl[=i]fan to slide, glide,
   make smooth, Icel. sl[=i]pa to whet; cf. also AS. sl?pan,
   Goth. sliupan, OS. slopian, OHG. sliofan, G. schliefen,
   schl?pfen, which seem to come from a somewhat different root
   form. Cf. {Slope}, n.]
   1. To move along the surface of a thing without bounding,
      rolling, or stepping; to slide; to glide.

   2. To slide; to lose one's footing or one's hold; not to
      tread firmly; as, it is necessary to walk carefully lest
      the foot should slip.

   3. To move or fly (out of place); to shoot; -- often with
      out, off, etc.; as, a bone may slip out of its place.

   4. To depart, withdraw, enter, appear, intrude, or escape as
      if by sliding; to go or come in a quiet, furtive manner;
      as, some errors slipped into the work.

            Thus one tradesman slips away, To give his partner
            fairer play.                          --Prior.

            Thrice the flitting shadow slipped away. --Dryden.

   5. To err; to fall into error or fault.

            There is one that slippeth in his speech, but not
            from his heart.                       --Ecclus. xix.
                                                  16.

   {To let slip}, to loose from the slip or noose, as a hound;
      to allow to escape.

            Cry, ``Havoc,'' and let slip the dogs of war.
                                                  --Shak.