weath·er·cock /-ˌkɑk/
  風標,隨風倒的人
  Weath·er·cock, v. t. To supply with a weathercock; to serve as a weathercock for.
     Whose blazing wyvern weathercock the spire.   --Tennyson.
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  Weath·er·cock n.
  1. A vane, or weather vane; -- so called because originally often in the figure of a cock, turning on the top of a spire with the wind, and showing its direction.  “As a wedercok that turneth his face with every wind.”
     Noisy weathercocks rattled and sang of mutation.   --Longfellow.
  2. Hence, any thing or person that turns easily and frequently; one who veers with every change of current opinion; a fickle, inconstant person.
  weathercock
       n : weathervane with a vane in the form of a rooster