Breadcrumb Home > Dictionary > Index N nail-biter: Meaning and Definition of Find definitions for: nail-bit•er Pronunciation: (nāl'bī"tur), [key] a person who bites his or her nails, esp. habitually. a situation marked by anxiety or tension. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nail nail-biting ✖ Related Content Daily Word Quiz: derogate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language