The phrase "threat messages" refers to any types of messages or communications that contain harmful, dangerous, or scary content intended to scare or intimidate someone. Full definition
The PDP spokesman said he suspected that the attack was politically motivated because he had received threat messages from suspected thugs of a major rival party in the state earlier. (punchng.com)
As Maureen suddenly starts receiving threat messages from a stranger who follows her every move, everything she has gets completely out of control. (thehollywoodnews.com)