at one fell swoop


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Related to at one fell swoop: out of whack

at one fell swoop

All at once, with a single decisive or powerful action. When the economy crashed, thousands lost their jobs, their homes, and their pensions at one fell swoop.
See also: fell, one, swoop

at one fell swoop

 and in one fell swoop
Fig. in a single incident; as a single event. (This phrase preserves the old word fell, meaning "terrible" or "deadly.") The party guests ate up all the snacks at one fell swoop. When the stock market crashed, many large fortunes were wiped out in one fell swoop.
See also: fell, one, swoop