一口咬定

Explanation: A bite tightly. Analogy uphold a clean, no longer changed to. 　　Source: Qing Anonymous "bureaucratic reform in mind," the 10th Amendment back to first abbot monk Hui, Yan-line trial, and asked where he would hide Li Guobin, Hui Li Guobin amendment insisted that does not recognize. " 　　Examples: Shandong old shook his head, ~ do not see, I know what's what! My family used to scale the Elder, 14 two new scales a pound, and no mistake. "★ Feng Deying" Flowers of Spring "Chapter XI