As one man Definition 1 of 2Pro Tip 1/3Unity Emphasis Emphasizes the unity of a group acting together, highlighting solidarity and togetherness. The team stood as one man during the national anthem. Pro Tip 2/3Instantaneity Stresses the suddenness and simultaneity of an action taken by a group. At the final whistle, the fans stood up as one man. Pro Tip 3/3Dramatic Effect Used to create a dramatic or impactful visualization of a group's synchronicity. The soldiers saluted as one man as the flag was raised.