Upper case and lower case.
Mind your p’s and q’s.
The wrong sort.
Out of sorts.
I learned yesterday during a visit to the San Diego Union Building in Old Town San Diego State Historic Park that these expressions are believed to come from days long past.
There was a period in history when printing was a tedious operation requiring a hand operated press. To print pages, small cast metal blocks that imprint individual characters were manually assembled into words and sentences. These physical types were set into printable forms by the skilled, quick fingers of print shop compositors.
See all those drawers in the above photo? Each drawer is a type case containing sorts, the particular letters and other characters that are “sorted” into the forms.
Somewhere along the line, capital letters were arranged in an upper drawer: the upper case. Compositors rushing to print a newspaper would sometimes confuse the similar appearing p’s and q’s. Or accidentally choose the wrong sort. Or become disconcerted when they ran out of sorts.
And that how these peculiar expressions are said to have originated!
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