/ˈwaɪərˌtæpər/ – noun
Definition: 1. người nghe trộm điện thoại;
2. thiết bị nghe trộm điện thoại.
A more thorough explanation: A wiretapper is a person who engages in the unauthorized interception of electronic communications, such as telephone calls or internet communications, for the purpose of secretly monitoring or recording the content of those communications. This activity is typically illegal and may violate privacy laws.
Example: The wiretapper was arrested for illegally intercepting phone conversations.