I have recently stumbled upon somebody saying:
I have decided to turn over a new leaf.
I was already aware of a similar expression with "page" instead. I have also heard of "leaflet" meaning (as far as I can tell) "flyer" or somesuch.
So can a leaf mean a page? In Finnish they can be interchanged in some rare cases. I had never heard of this in English though.
"Leaf" seems to be defined here as a double-sided page from a piece of paper folded vertically (courtesy of a quick bit of Googling):
Can the words be interchanged in general usage?