out·sid·er /ˌaʊtˈsaɪdɚ/
  門外漢;局外人;圈外人
  Out·sid·er n.
  1. One not belonging to the concern, institution, party, etc., spoken of; one disconnected in interest or feeling. [Recent]
  2. A locksmith's pinchers for grasping the point of a key in the keyhole, to open a door from the outside when the key is inside.
  3. A horse which is not a favorite in the betting. [Cant]
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  outsider
       n 1: someone who is excluded from or is not a member of a group
            [syn: foreigner]
       2: a constestant (human or animal) not considered to have a
          good chance to win