n. A bird that flies to a great height; hence, one who is extravagant or goes to extremes in his aims, actions, or pretensions: sometimes applied in England to a genteel beggar.n. One of certain geometrid moths: an English collector’ name. The ruddy high-flier is Ypsipetes ruberata; the July high-flier is Y. elutata.n. A phaëton with low front wheels, arched reaches, and boxes over both axles.