joint action; acting in unison
Refers to coordinated, collective action taken by a group, often in political, labor, or organizational contexts.
The labor union took joint action to demand a wage increase.
Several organizations are planning a coordinated action.
共同行動 also means joint action, but 統一行動 emphasizes unity and solidarity, often in a movement or campaign, while 共同行動 can be more general cooperation.
Compound of 統一 (とういつ, 'unity, unification') and 行動 (こうどう, 'action, behavior').