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Phrase(s): bite one’s nails
1. to use one’s teeth to remove parts of one’s fingernails as a means of shortening them. • Stop biting your nails! Use clippers! 2. to literally bite one’s nails from nervousness or anxiety; to be nervous or anxious. • I spent all afternoon biting my nails, worrying about you. • We’ve all been biting our nails from worry.
McGrawhill's American Idioms And Phrasal Verbs