凶相毕露 xiōngxiàng-bìlù
[show one's ferocity;reveal the atrocious features;with the fierce feature fully exposed bare one's fangs] 凶恶的面目完全暴露
柯岩 《追赶太阳的人》:“ 吴丙治 向他征收税款时,他凶相毕露地威胁:‘谁有钱给你,小心你的脑袋吧!’”。”