Run that by again
Run that by (me) again.and Run it by (me) again.
Inf. Please repeat what you just said.; Please go over that one more time. Alice: Do you understand? Sue: No. I really didn't understand what you said. Run that by me again, if you don't mind. John: Put this piece into the longer slot and the remaining piece into the slot on the bottom. Sue: Run that by again. I got lost just after put. Mary: Keep to the right, past the fork in the road, then turn right at the crossroads. Do you follow? Jane: No. Run it by me again.