SWOOP, verb transitive [This is probably from sweep, or the same root.]
1. To fall on at once and seize; to catch while on the wing; as, a hawk swoops a chicken; a kite swoops up a mouse.
2. To seize; to catchup; to take with a sweep.
3. To pass with violence.
SWOOP, verb intransitive To pass with pomp.
SWOOP, noun A falling on and seizing, as of a rapacious fowl on his prey.
The eagle fell--and carried away a whole litter of cubs at a swoop