[for a group of people or things] to bunch together, surrounding someone or something. The birds clustered around the chimney top to keep warm.The kids clustered around the police officer.
cluster someone or something around someone or something
to bunch people or things together around someone or something. She clustered the cups around the punch bowl.Karen clustered the children around the fire.
to bunch or group together. All of the bats clustered together on the roof of the cave.The children clustered together in small groups here and there on the playground.
1. n. an act of group rape. (Also Charlie Foxtrot from the initials CF. Usually objectionable.) Look at her! She’s just asking for a cluster fuck.
2. n. any event as riotous as an act of group rape. (Figurative on sense 1 The same allusion as sense 1) This goddamn day has been one long cluster fuck!