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Definition of fallout

fallout

/ˈfɔːl.aʊt/
fall · out

Plural:fallouts
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fallout Lexical Profile

fallout Game Scores & Validity

• noun

1

The adverse side effects, repercussions, or aftermath of an event, decision, or situation.

Example

"The company struggled for months to manage the public relations fallout from the data breach."


2

Airborne radioactive particles and dust that settle to the earth's surface following a nuclear explosion or accident.

Example

"Scientists monitored soil and water samples for decades to measure the environmental impact of radioactive fallout."


3

A serious disagreement or quarrel that damages a relationship between people; a falling-out.

Example

"The two business partners had a bitter fallout over the direction of the firm and stopped speaking."

Synonyms
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Antonyms
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Word Nuance & Usage

The closed noun 'fallout' (meaning adverse consequences or radioactive debris) is distinct from the two-word phrasal verb 'fall out' (meaning to quarrel or drop from a place).

• Rhymes for fallout

Word Origin & Etymology

Coined in the late 1940s from the verbal phrase 'fall out,' originally referring specifically to airborne radioactive particles settling to the ground after a nuclear test before broadening to mean any adverse aftermath.

Cite this Entry


Wordmom. (2026). Definition of Fallout. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/fallout
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