[in one fell
swoop] or [at one fell swoop] {adv. phr.} 1.{literary} In one attack or
accident; in one bad blow.
Themillionaire lost his money and his friends at
one fell swoop.
2. Atone time; at the same time.
Three cars drove into the
driveway, andMrs. Crane's dinner guests all arrived at one fell
swoop.
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