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." Chaucer. Noisy weathercocks rattled and sang of mutation. Longfellow.
Hence, any thing or person that turns easily and frequently; one who veers with every change of current opinion; a fickle, inconstant person.
To supply with a weathercock; to serve as a weathercock for. Whose blazing wyvern weathercock the spire. Tennyson.
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