bull's-eye /ˈbʊlˌzaɪ ||ˈbʌl-/
  靶心
  Bull's-eye n.
  1. Naut. A small circular or oval wooden block without sheaves, having a groove around it and a hole through it, used for connecting rigging.
  2. A small round cloud, with a ruddy center, supposed by sailors to portend a storm.
  3. A small thick disk of glass inserted in a deck, roof, floor, ship's side, etc., to let in light.
  4. A circular or oval opening for air or light.
  5. A lantern, with a thick glass lens on one side for concentrating the light on any object; also, the lens itself.
  6. Astron. Aldebaran, a bright star in the eye of Taurus or the Bull.
  7. Archery & Gun. The center of a target.
  8. A thick knob or protuberance left on glass by the end of the pipe through which it was blown.
  9. A small and thick old-fashioned watch. [Colloq.]
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