群むれ集あつまる

godan verb (-ru)

gather in large groups; flock together; swarm

Describes people or animals coming together in a crowd or swarm; often implies a large, noticeable gathering.

• 駅えき前まえに若わか者ものが群むれ集あつまっていた。

  Young people were gathering in large groups in front of the station.

• 夏なつになると海かい岸がんにクラゲが群むれ集あつまる。

  In summer, jellyfish swarm near the shore.