The Vietnamese word "nội gián" is a noun that means "planted spy" or "insider spy." It refers to a person who is secretly working for one group while pretending to be part of another, often with the intention of gathering information or causing harm.
"Công ty của chúng tôi đã bị một nội gián đánh cắp thông tin."
"Nội gián trong quân đội có thể gây ra những hậu quả nghiêm trọng."
In more advanced contexts, "nội gián" can be used to discuss topics related to security, trust, and betrayal within organizations or nations. It can also be used metaphorically to describe someone who betrays their friends or group for personal gain.
While "nội gián" primarily means "planted spy," in broader discussions, it can also imply issues of loyalty, betrayal, and the dynamics of trust within any group or organization.