fallout

noun
fall·​out | \ ˈfȯl-ˌau̇t How to pronounce fallout (audio) \

Definition of fallout

 (Entry 1 of 2)

1a : the often radioactive particles stirred up by or resulting from a nuclear explosion and descending through the atmosphere also : other polluting particles (such as volcanic ash) descending likewise
b : descent (as of fallout) through the atmosphere
2 : a secondary and often lingering effect, result, or set of consequences have to take a position and accept the political fallout— Andy Logan

fall out

verb
fell out; fallen out; falling out; falls out

Definition of fall out (Entry 2 of 2)

intransitive verb

1 : quarrel also : to cut off relations over a quarrel former friends who have fallen out
2 : turn out, happen expected to be in the States …  , but things fell out otherwise— Mark Twain
3a : to leave one's place in the ranks
b : to leave a building in order to take one's place in a military formation