Weathercock

Webster's Dictionary of the English Language

·vt To supply with a weathercock; to serve as a weathercock for.

II. Weathercock ·noun Hence, any thing or person that turns easily and frequently; one who veers with every change of current opinion; a fickle, inconstant person.

III. Weathercock ·noun 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.