expression, ichidan verb
give a command; give an order
Typically used for issuing a clear, often loud, command to a group, such as in military, sports, or classroom settings.
先生が号令をかけると、生徒たちは一斉に立ち上がった。
When the teacher gave the command, the students all stood up at once.
The captain gave the order, and the squad began to march.