On the doorstep she stopped sharp.
玄関前の階段で彼女は急に止まった
on [at] the edge of (the) town
町はずれに［で］
on the edge of a cliff
がけの縁で［に］
on the eve of the election
選挙直前に
on the evening of March 31st
３月３１日の晩に
on the face of the document
書面に
on the faith of ...
…を信用して［保証として］
on the far [other, opposite] side of the room
部屋の向こう側に
on [((英))in] the firing line
第一線で；矢面に立って
on the first pass
最初の段階で
