weathercock

[ weth -er-kok ]

/ ˈwɛð ərˌkɒk /

a weather vane with the figure of a rooster on it.

(loosely) any weather vane.

a person who readily adopts the latest fads, opinions, etc.: The count is the weathercock of the jet set.

Origin of weathercock

First recorded in 1250–1300, weathercock is from the Middle English word wedercoc. See weather, cock¹

Let us suppose that two people are using them to look at an arrow on a weathercock a long distance off.

Through Magic Glasses and Other Lectures |Arabella B. Buckley
I have no command of my talents such as they are, and have to watch the varyings of my mind as I would a weathercock.

Washington Irving |Henry W. Boynton
They are as careful of the age as the weathercock is of the wind.

The Works of Whittier, Volume VI (of VII) |John Greenleaf Whittier
It was in vain that one party objected to the weathercock politics of Talleyrand.

The History of Napoleon Buonaparte |John Gibson Lockhart

"While you were asleep, my dear little Madge," answered the Weathercock.

The Cruise of the Noah's Ark |David Cory

weathercock

/ (ˈwɛðəˌkɒk) /

a weather vane in the form of a cock

a person who is fickle or changeable

(intr) (of an aircraft) to turn or tend to turn into the wind