fallout

(countable, uncountable) The event of small airborne particles falling to the ground in significant quantities as a result of major industrial activity, volcano eruption, sandstorm, nuclear explosion, etc.
(countable, uncountable) The particles themselves.
(countable, uncountable) A negative side effect; an undesirable or unexpected consequence.
(countable, rare, uncountable) A declined offer in a sales transaction when acceptance was presumed.
(countable, rare, uncountable) The person who declines such an offer.
(countable, uncountable) An impromptu guest used to fill in for another guest spot who is a no-show or who has cancelled last minute.