Bùguǎn biérén zěnme wèn, tā dōu yīkǒuyǎodìng zhè shì zìjǐ de zhǔyi.
No matter how others asked, she stuck to her story that it was her own idea.
Tips
history
From the late-Qing novel 《官场维新记》 chapter 10: 「慧修一口咬定不认得李国斌」 — the monk Huixiu 'clamped down' on his claim of not knowing the suspect. The metaphor is a dog biting shut and refusing to let go.
memory
Picture biting down (咬) on a statement like a dog on a bone — jaw locked shut (一口, 'in one mouthful'), no matter who tries to pry it loose.
