A weather vane, sometimes in the form of a cockerel. / (figuratively) One who veers with every change of current opinion; a fickle, inconstant person.

(intransitive, of a boat) To turn upwind because of the difference in water pressure on two sides. / (intransitive, of an airplane or missile) To veer into the direction of the oncoming (relative) wind.

plural of weathercock

simple past tense and past participle of weathercock

present participle of weathercock

Synonym of weathercockish

Fickle or changeable in one's views.