verb (used without object)
to sweep through the air, as a bird or a bat, especially down upon prey.
to come down upon something in a sudden, swift attack (often followed by down and on or upon ): The army swooped down on the town.
verb (used with object)
to take, lift, scoop up, or remove with or as with one sweeping motion (often followed by up, away, or off ): He swooped her up in his arms.
an act or instance of swooping; a sudden, swift descent.
at/in one fell swoop, all at once or all together, as if by one blow: The quake flattened the houses at one fell swoop.

1535–45; variant (with close ō) of Middle English swopen, Old English swāpan to sweep1; cognate with German schweifen

4. dive, plunge, sweep, drop.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
swoop (swuːp)
1.  (intr; usually foll by down, on, or upon) to sweep or pounce suddenly
2.  (tr; often foll by up, away, or off) to seize or scoop suddenly
3.  the act of swooping
4.  a swift descent
[Old English swāpan to sweep; related to Old High German sweifan to swing around, Old Norse sveipa to throw]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1566, "to move or walk in a stately manner," apparently from a fial. survival of O.E. swapan "to sweep, brandish, dash," from P.Gmc. *swaipanan, from PIE base *swei- "to swing, bend, to turn." Meaning "pounce upon with a sweeping movement" first recorded 1638. Spelling with -oo- may have been influenced
by Scot. and northern England dial. soop "to sweep," from O.N. sopa "to sweep." The noun is attested from 1544. Phrase one fell swoop is from Shakespeare.
"Oh, Hell-Kite! All? What, All my pretty Chickens, and their Damme, At one fell swoope?" ["Macbeth," IV.iii.219]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Then they bring the husbands, and the brothers, and everyone gets swooped up
  into this magical experience.
Bystanders swooped in to tend to those who had been sprayed, as police in riot
  gear stood watch.
He had machete wounds to his neck, suffered as he tried to escape the tribal
  militiamen who swooped down on his village recently.
He swooped in, punched the button and snatched the cash voucher.
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