**Bystander** (noun) — a person who is present at an event or incident but does not actively participate in it.
Here are some examples of using the word «bystander»:
1. The bystanders watched in horror as the car accident unfolded in front of them.
2. She felt embarrassed to ask for help, so she tried to deal with the problem on her own, hoping that no bystanders would notice.
3. The bystanders gathered around to witness the magician's impressive trick.
4. The police urged bystanders to provide any information they might have about the crime.
5. He felt ashamed of himself for not helping the injured bystander after the accident.
6. The bystanders were shocked and horrified by the violence they witnessed.
7. The bystander effect, also known as the witness apathy effect, is a social psychological phenomenon.
8. The bystander did not intervene when he saw the bullying, fearing that he might get involved in the conflict.
9. The bystanders cheered and applauded the athletes as they crossed the finish line.
10. The bystanders were curious about what was happening, but they did not dare to approach the scene.