why is the zipper in my pants called the "fly"?

Question

and why does it zip up instead of down to close?
down to close makes more sense.

Answer 1

The zipper itself isn't the fly, it's the fold of material.

"Fly" used to mean something attached on the side, like a tent flap, or a piece of fabric on a garment that conceals a fastener.

Answer 2

If it zipped down to close then it would fly open when you sat down. Maybe that's is why it is called a fly because it can fly open. Before the zipper buttons were used.

Answer 3

Fly was the term used for a front opening in trousers/slacks/pants. The zipper was there to close the "fly"

Answer 4

i think its called a fly because it sounds like it when you zip it up and i have no idea why it zips up instead of down but good question, I also would like to know

Answer 5

i don't no i think its some kind of slang for crotch
why don't u reverse it and make a new trend and patent it make some bill gates money

Answer 6

why not!