What is the meaning of Your fly is open? - Question about English (US)

Definition of Your fly is open It means your pants zipper is down. |So the zipper itself is not the fly. The cloth covering the zipper is the fly. |fly = zipper|"A fly on clothing is a covering over an opening concealing the mechanism, such as a zip, velcro, or buttons, used to close the opening. An open fly is a fly that has been left unzippedor unbuttoned." This is from Wikipedia |@toron You could say "Your pants are unzipped." "Your zipper is down." or "Your fly is open." All of them are common ☺️|@toron good question:))) no idea..
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