Weathercock

Part of speech: noun (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." Chaucer. 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.

Part of speech: verb (v.)

To supply with a weathercock; to serve as a weathercock for. Whose blazing wyvern weathercock the spire. Tennyson.