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1. The radioactive particles that settle to the ground after a nuclear explosion
   - radioactive dust
    
2. Any adverse and unwanted secondary effect
   "a strategy to contain the fallout from the accounting scandal";
   - side effect

1. Have a breach in relations
   "We fell out over a trivial question"
    
2. Be a logical consequence
   "the theorem falls out nicely";
   - follow
    
3. Drop out
   "His hair and teeth fell out";
   - come out
    
4. Leave (a barracks) in order to take a place in a military formation, or leave a military formation
   "the soldiers fell out"
    
5. (of an event) come to pass (in time, so that it is real and actual at some time)
   "What is falling out?";
   - happen, hap [archaic], go on, pass off, occur, pass, come about, take place

Derived forms: fallen out, fallouts, falls out, falling out, fell out

Type of: altercate, argufy, come forth, come out, consequence, dispute, dust, effect, egress, emerge, ensue, event, exit, get out, go forth, go out, issue, leave, outcome, quarrel, result, row[2], scrap, upshot

Encyclopedia: Fallout