The Collaborative International Dictionary of English v.0.48:

Out \Out\ (out), n.
   1. One who, or that which, is out; especially, one who is out
      of office; -- generally in the plural.
      [1913 Webster]

   2. A place or space outside of something; a nook or corner;
      an angle projecting outward; an open space; -- chiefly
      used in the phrase ins and outs; as, the ins and outs of a
      question. See under In.
      [1913 Webster]

   3. (Print.) A word or words omitted by the compositor in
      setting up copy; an omission.
      [1913 Webster]

   To make an out (Print.),
      (a) to omit something, in setting or correcting type,
          which was in the copy.
      (b) (Baseball) to be put out in one's turn at bat, such as
          to strike out, to ground out, or to fly out.
          [1913 Webster]

WordNet (r) 3.0 (2006):

strike out
    v 1: remove from a list; "Cross the name of the dead person off
         the list" [syn: cross off, cross out, strike out,
         strike off, mark]
    2: put out or be put out by a strikeout; "Oral struck out three
       batters to close the inning"
    3: be unsuccessful in an endeavor; "The candidate struck out
       with his health care plan"
    4: make a motion as with one's fist or foot towards an object or
       away from one's body
    5: cause to get out; "The pitcher retired three batters"; "the
       runner was put out at third base" [syn: retire, strike
       out]
    6: set out on a course of action; "He struck out on his own"