by and large » by enlarge
I found this in the comments to a blog (I didn’t note which one). I collect what I call ‘bloggos’ - unusual word usages I find that seem to pop up often in blogs. The complete sentence was:
I don’t have the numbers, but by enlarge, I believe older guys date younger girls.
All I can remember is that the writer seemed very literate, aside from this one slip. A Google search finds over 50,000 hits for the expression, including, for example:
Endoscopic drainage, by enlarge, fails to achieve these principles
which comes from an academic paper, here: