An opening at the crotch of a pair of pants, closed with a zipper or buttons and typically covered with a flap. The space over the stage in a theater. A one-horse hackney carriage. A flying insect of a large order characterized by a single pair of transparent wings and sucking (and often also piercing) mouthparts. Flies are noted as vectors of disease. (of a bird or other winged creature) move through the air under control. Move or be hurled quickly through the air. (especially of hair) wave or flutter in the wind. Flee; run away. Be successful. Stylish and fashionable. Knowing and clever; worldly-wise.