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re·group / rēˈgroōp/ • v. [intr.] (of troops) reassemble into organized groups, typically after being attacked or defeated: their heroic resistance gave American forces time to regroup. ∎  [tr.] cause to reassemble in this way: he regrouped his fighters in the hills. ∎  [tr.] rearrange (something) into a new group or groups: she was regrouping the numeric data.DERIVATIVES: re·group·ment n.