The word "恫吓" is formed by combining the characters "恫" and "吓". "恫" is a phono-semantic character with the heart radical (忄) indicating emotion and the component "同" suggesting pronunciation, conveying the sense of fear. "吓" is also phono-semantic, with the mouth radical (口) implying speech or sound and "下" hinting at pronunciation, conveying the act of frightening. Together, they semantically merge to mean to threaten or intimidate, with each character contributing aspects of emotional fear and verbal menace.