Definition of bite one's nails in English:

bite one's nails

Chew at one’s nails as a nervous habit: I used to bite my nails
More example sentences
  • This particular piece of info/tip relates to writing novels - a distressingly bad habit, like biting your nails, which some of you seem to have picked from mixing with entirely the wrong people.
  • Parents must keep their children away from unsterile food and prevent such habits as biting their nails.
  • The relationship seems to work wonders on him, too, as he begins to shed pounds, visit the gym and even break his long-standing habit of biting his nails.
See parent entry: bite

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
cause (someone) to lose confidence or hope