The use of this word by Mr Campbell struck me as odd, so I checked in my Chambers Dictionary. It's not there. Did he invent it? A vague memory stirs, that Dr Pike used it long ago, so perhaps it forms part of the private language of cyclists, as perhaps does 'modal shift', which always makes me think of Twiggy in a Mary Quant minidress.
Arnold Saxton ● 1573d