成群结队

成群結隊
chéngqúnjiéduì
(idiom) making up a group; forming a troupe; in large numbers; as a large crowd

CEDICT

Entry Composition

1 成群 chéngqún
  1. in groups
  2. large numbers of
  3. grouping
2 结队 jiéduì
  1. to troop (of soldiers etc)
  2. convoy