From Longman Dictionary of Contemporary Englishrain down phrasal verbDOWNto fall in large quantities on Bombs rained down on the city. → rain→ See Verb table
Examples from the Corpus
rain on• The glory he never experienced as an amateur wrestler rained down on him like tinsel in the Octagon.• While debris rained down on much of Western Washington during the quake, the more typical liquid precipitation has been strangely absent.• There was mayhem as shrapnel rained down on shoppers from devices placed in cast-iron litter bins less than ten yards apart.• These people are afghans ... a few of the one million who fled the rockets raining down on the capital city, Kabul.• Much smaller ones, called micrometeorites, have also continually rained down on the Mo&n over the millennia.• Flame rained down on the Perks.• Condemnation has rained down on the Scouts.• Bombs and poison gas would rain down on undefended cities. 