Medical Definition of nail-biting
: habitual biting at the fingernails usually being symptomatic of emotional tensions and frustrations
— called also onychophagia, onychophagy
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“Nail-biting.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/nail-biting. Accessed 27 Sep. 2021.
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