How do you say when you notice some guy's trousers' zipper is open?
Do you say "Close your zipper!" or "Examine your zipper" or just "zip it up"?
In BrE:
Your flies are undone.
You're flying low.
By the way, it doesn't have to be a guy whose zip is undone. ;-)
Can you explain what these two sentences imply? Literally, they make little sense to me.
I have a feeling that in BrE it was originally just "Your fly's undone" or "Your fly's open" but at some point "fly's" was turned into (misheard as?) "flies" which is why the "are" was added.
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