/ˈθrɛtənɪŋ ˈlɛtər/ – Phrase
Definition: thư hăm dọa.
A more thorough explanation: A threatening letter is a written communication that contains menacing or intimidating language, with the intent to cause fear, harm, or distress to the recipient. It may include explicit threats of violence, harm, or other unlawful actions.
Example: The recipient of the threatening letter reported it to the police.