noun. ['ˈklʌbɪŋ'] a condition in which the ends of toes and fingers become wide and thick; a symptom of heart or lung disease.
1. Verb, gerund or present participle You may not be of legal drinking age, but you can still go clubbing in San Francisco. 2. Noun, singular or mass Nail clubbing is the downward curve of your nails, along the curvature of your finger.