swoop

Short definition from Wiktionary

Verb

1. 1
   To fly or glide downwards suddenly; to plunge (in the air) or nosedive.
2. 2
   To move swiftly, as if with a sweeping movement, especially to attack something.
3. 3
   To fall on at once and seize; to catch while on the wing.
4. 4
   To seize; to catch up; to take with a sweep.
5. 5
   To pass with pomp; to sweep.
6. 6
   To search the ground for discarded cigarette butts that can be made into new cigarettes.

Noun

1. 1
   An instance, or the act of suddenly plunging downward.
2. 2
   A sudden act of seizing.
3. 3
   A quick passage from one note to the next.