nail file
US /ˈneɪl faɪl/
UK /ˈneɪl faɪl/

1.
指甲锉
a small metal or emery board tool with a rough surface, used for shaping and smoothing the edges of fingernails or toenails
:
•
She used a nail file to smooth the rough edges of her manicure.
她用指甲锉打磨指甲粗糙的边缘。
•
Always carry a nail file in your purse for emergencies.
包里常备一个指甲锉以备不时之需。