an opening at the crotch of a pair of pants, closed with a zipper or buttons and typically covered with a flap.
Interesting alternatives are Velcro straps or, if the shorts fit perfectly, stylish button flies .
the space over the stage in a theater.
The rest, even while the scenery keeps rising from the floor or descending from the flies , remains unremittingly flat.
a one-horse hackney carriage.
The season at Solentsea was now past: the parade was gloomy, and the flys were few and cheap.
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.
Almost 40 years ago Ed Lewis discovered a remarkable fly that differs from an ordinary fly by one extra pair of wings.