1. people who watch something happening but are not directly involved
Usage: plural form of onlooker

Examples

• A crowd of onlookers gathered to watch the street performance.
• The accident drew many onlookers who stopped to see what happened.
• Police asked the onlookers to move back from the crime scene.
• Curious onlookers peered through the windows of the new restaurant.
• The parade attracted thousands of onlookers lining the streets.
• Emergency workers had to push through the onlookers to reach the victim.