bite one's nails

bite (one's) nails

1. Literally, to chew on one's fingernails and shorten them. I wish I didn't bite my nails, but it's been such a hard habit to try to break. My sister gets regular manicures to keep from biting her nails.
2. To nervously await something. I've been biting my nails ever since I submitted my application for my first-choice college.
See also: bite, nail
Farlex Dictionary of Idioms.

bite one's nails

Exhibit signs of anxiety, impatience, or nervousness, as in We'll be biting our nails till the jury comes back. Biting one's fingernails is a time-honored sign of emotional tension. The Roman satirist Horace described it about 35 b.c.: "As he wrought his verse he would often ... gnaw his nails to the quick" ( Satires, Book 1).
See also: bite, nail
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • bite (one's) nails
  • bite nails
  • bite your nails/fingernails
  • fingernail
  • hang on by (one's) fingernails
  • cling on by (one's) fingernails
  • break (one's) habit
  • break a habit
  • break a/the habit
  • be (as) hard as nails
References in periodicals archive
The former can make one cringe and bite one's nails, but then really, who doesn't want to be more glamorous, worldly and knowledgeable than one actually is?