Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The slow descent of minute particles of debris in the atmosphere following an explosion, especially the descent of radioactive debris after a nuclear explosion.
  • noun The particles that descend in this fashion.
  • noun An incidental result or side effect.

from the GNU version of the Collaborative International Dictionary of English.

  • noun the radioactive particles that settle to the ground after a nuclear explosion.
  • noun the falling to the ground of radioactive particles lifted into the atmosphere by a nuclear explosion.
  • noun an incidental or unexpected effect, especially one which is undesirable, consequent to an event or process; ; -- usually used only in the singular.
  • noun (Med.), cant one selected from a group by some criterion.
  • noun cant one who fails to maintain the same pace as and lags behind a group of which s/he is a member.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun 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.
  • noun The particles themselves.
  • noun A negative side effect; an undesirable or unexpected consequence.
  • noun rare A declined offer in a sales transaction when acceptance was presumed.
  • noun rare The person who declines such an offer.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the radioactive particles that settle to the ground after a nuclear explosion
  • noun any adverse and unwanted secondary effect
  • verb leave (a barracks) in order to take a place in a military formation, or leave a military formation
  • verb come as a logical consequence; follow logically
  • verb have a breach in relations
  • verb come to pass
  • verb come off

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the verb fall out; fall +‎ out

Examples

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