clubbing

(noun) a condition in which the ends of toes and fingers become wide and thick; a symptom of heart or lung disease.

(verb) unite with a common purpose. Synonyms: club. Example: "The two men clubbed together."

(verb) gather and spend time together. Synonyms: club. Example: "They always club together."

(verb) strike with a club or a bludgeon. Synonyms: club, bludgeon.

(verb) gather into a club-like mass. Synonyms: club. Example: "Club hair."