1. People who enter a party, event, or gathering without an invitation or permission.
Usage: informal; plural form of crasher
2. Things that crash or collide; objects involved in collisions.
Usage: informal; plural form of crasher

Examples

• The security team removed several crashers from the wedding reception.
• Party crashers showed up uninvited and caused a scene.
• The nightclub hired bouncers to keep out crashers.
• A group of crashers tried to sneak into the concert.
• The host was frustrated when crashers arrived at the private event.
• Campus security dealt with multiple crashers at the student dance.