nail file
US /ˈneɪl faɪl/
UK /ˈneɪl faɪl/
1.
a small metal or emery board tool with a rough surface, used for shaping and smoothing the edges of fingernails or toenails
:
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She used a nail file to smooth the rough edges of her manicure.
•
Always carry a nail file in your purse for emergencies.