verb

(of a bird, bat, or insect) move through the air using wings.

close the door or the moths will fly in

travel through the air,wing its way,wing,glide,soar,wheel,flutter,flit,hover,hang,take wing,take to the air,mount

noun

an opening at the crotch of a pair of trousers, closed with a zip or buttons and typically covered with a flap.