Definition of swoop:
(v) :
to
plunge downwards suddenly; to
nosedive; to rushedly do something, as if it was done with a sweeping movement
"the lone hawk swooped down into the lake, snatching and devouring its prey, a small fish."
(n) :
an instance, or the act of suddenly
plunging downward; an act of rushedly doing something
"the quality of decision is like the well-timed swoop of a falcon which enables it to strike and destroy its victim. – Sun Tzu"