Hurriedly, Americans displaced by Europeans in London street (4-4)
I believe the answer is:
pell-mell
But I can't explain it at all! Could you help me understand?
(Other definitions for pell-mell that I've seen before include "In a rush, like heavy rain" , "Impetuously" , "Headlong like heavy rain" , "In hurried disorderly manner, headlong" , "(Rush) headlong, madly" .)