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WordReference Random House Learner's Dictionary of American English © 2024fall•out or fall-out /ˈfɔlˌaʊt/USA pronunciation n. [uncountable]- Meteorologythe settling to the ground of particles ejected into the atmosphere from the earth by explosions, eruptions, forest fires, etc., esp. such settling from nuclear explosions.
- the particles themselves.
WordReference Random House Unabridged Dictionary of American English © 2024fall•out (fôl′out′),USA pronunciation n. - Meteorologythe settling to the ground of airborne particles ejected into the atmosphere from the earth by explosions, eruptions, forest fires, etc., esp. such settling from nuclear explosions (radioactive fallout.) Cf. rainout.
- the particles themselves. Cf. rainout.
- an unexpected or incidental effect, outcome, or product:the psychological fallout of being obese.
- effects;
results:emotional fallout from a divorce.
Also, fall′-out′. - noun, nominal use of verb, verbal phrase fall out 1945–50
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