Etymology
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fallout (n.)

also fall-out, "radioactive particles," 1950, from fall (v.) + out (adv.).

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Definitions of fallout

fallout (n.)
the radioactive particles that settle to the ground after a nuclear explosion;
Synonyms: radioactive dust
fallout (n.)
any adverse and unwanted secondary effect;
a strategy to contain the fallout from the accounting scandal
Synonyms: side effect
From wordnet.princeton.edu