Acting as a group; multiple people doing something together in an organized way (e.g., group movement, collective action).
遠足では先生の指示に従って団体行動を守ってください。
On the field trip, please follow the teacher's instructions and keep to group behavior.
会社では団体行動が求められる場面が多いが、個人の裁量も重要だ。
At companies there are many situations that require group action, but individual discretion is also important.
そのデモは多くの参加者による団体行動だった。
That protest was a collective action by many participants.