Longman Dictionary of Contemporary English
Wiktionary
alt. A small file made of soft metal, or a board covered with fine sandpaper, for filing and shaping one's fingernails and toenails. n. A small file made of soft metal, or a board covered with fine sandpaper, for filing and shaping one's fingernails and toenails.
Wikipedia
A nail file is a tool used to gently grind down and shape the edges of nails. They are often used in manicures and pedicures after the nail has been trimmed using appropriate nail clippers. Nail files may either be emery boards, ceramic, glass, crystal, plain metal files or metal files coated with corundum ( sapphire).
Usage examples of "nail file".
All of these demands the same ridiculous patience as, say, tunneling out of a prison with a teaspoon, or sawing through iron bars with a nail file.
Clenching the nail file, she moved on hands and knees beneath the pine boughs and poked her head out into the clearing of the trail.
If the person stealing the towel filed or cleaned his nails there will be evidence of the fibers on his pocket knife or finger-nail file.
By this time, she had overcome her initial shock and was trying to get the nail file out of her purse.
Frowning at a fingernail, she called in a nail file and smoothed an edge, studied the result, and smoothed again.
Finally satisfied, she vanished the nail file and smiled at Hekatah.
He removed it, opened the nail file, began idly cleaning his nails.
He cased the shops, followed the victims home and killed them by cutting their throats with a sharpened nail file.
If you have a nail file or something, I'll unscrew the back plate and show you.
She examined in turn the powder in her compact, the ridges on her nail file, the way her comb was inflexible and the threads of her handkerchief.