round up

(noun) the activity of gathering livestock together so that they can be counted or branded or sold. Synonyms: roundup.

(noun) a summary list; as in e.g. "a news roundup". Synonyms: roundup.

(noun) the systematic gathering up of suspects by the police. Synonyms: roundup. Example: "A mass roundup of suspects."

(verb) seek out and bring together. Synonyms: round up. Example: "Round up some loyal followers."