infiltrator
🇺🇸
/ˈɪnfɪltreɪtər/
🇬🇧
/ˈɪnfɪltreɪtə(r)/
Someone who sneaks into a group or place to gather information or to influence it.
The security guard caught an infiltrator trying to sneak into the company's database.
경비원은 회사의 데이터베이스에 침투하려는 침투자를 잡았습니다.