say it: FAW-lowt
fallout is a noun meaning "the radioactive particles that settle to the ground after a nuclear explosion". It carries 2 recorded senses.
the radioactive particles that settle to the ground after a nuclear explosion
any adverse and unwanted secondary effect
“a strategy to contain the fallout from the accounting scandal”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for fallout come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.