Source : Webster's Revised Unabridged Dictionary (1913)

Gaggle \Gag"gle\, v. i. [imp. & p. p. {Gaggled}; p. pr. & vb. n.
   {Gaggling}.] [Of imitative origin; cf. D. gaggelen, gagelen,
   G. gackeln, gackern, MHG. g?gen, E. giggle, cackle.]
   To make a noise like a goose; to cackle. --Bacon.

Gaggle \Gag"gle\, n. [Cf. {Gaggle} v. i.] (Zo["o]l.)
   A flock of wild geese. [Prov. Eng.] --Halliwell.

Source : WordNet®

gaggle
     n : a flock of geese
     v : make a noise characteristic of a goose; "Cackling geese"