咬指甲

[yǎo zhǐ jia]

• chew one's fingernails
• nail biting

例句

1. 你为什么老是咬指甲？
   Why are you always biting your nails?
2. 别再咬指甲了！
   Stop biting your nails!
3. 她咬指甲（一直）咬到肉。
   She has bitten her nails (down) to the quick.
4. 她正在神经质地咬指甲。
   She was gnawing her nails nervously.