Probably. The usual phrase is backing up the car , I think-- at least for short distances.
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CalifJim I would not omit "up".
CJ
Thanks, Mister and Jim.
But could you tell me why? It seems to me that "up" is optional.
AngliholicBut could you tell me why? It seems to me that "up" is optional.I don't have an answer as to why. It's just that I am unable to assign any coherent meaning to "Jack is backing". It sounds incomplete. It could even be the beginning of "Jack is backing Smith for dog catcher" (Jack is supporting Smith to be elected as dog catcher.)