Off Of :



For most Americans, the natural thing to say is “Climb down off of [pronounced “offa”] that horse, Tex, with your hands in the air”; but many UK authorities urge that the “of” should be omitted as redundant.


Where British English reigns you may want to omit the “of” as superfluous, but common usage in the US has rendered “off of” so standard as to generally pass unnoticed, though some American authorities also discourage it in formal writing.


But if “onto” makes sense, so does “off of.” However, “off of” meaning “from” in phrases like “borrow five dollars off of Clarice” is definitely nonstandard.