a slip of the pen

a slip of the pen

A slip of the pen is something you wrote by mistake. The translator dated his letter `Plymouth 1 June 1618'. This is wrong, and probably a slip of the pen for 11 June.
See also: of, pen, slip

a slip of the ˈtongue/ˈpen

a small mistake when speaking or writing: Did I say North Street? Sorry, that was a slip of the tongue — I meant South Street.
See also: of, pen, slip, tongue