noun

• (countable) A heavy object, often a kind of stick, intended for use as a bludgeoning weapon or a plaything.
  "There were many wooden chairs for the bulk of his visitors, and two wicker armchairs with red cloth cushions for superior people. From the packing-cases had emerged some Indian clubs,[…], and all these articles[…] made a scattered and untidy decoration that Mrs. Clough assiduously dusted and greatly cherished."
• (countable) A heavy object, often a kind of stick, intended for use as a bludgeoning weapon or a plaything.
• (countable) A heavy object, often a kind of stick, intended for use as a bludgeoning weapon or a plaything.
• (countable) An association of members joining together for some common purpose, especially sports or recreation.
  "At half-past nine on this Saturday evening, the parlour of the Salutation Inn, High Holborn, contained most of its customary visitors.[…]In former days every tavern of repute kept such a room for its own select circle, a club, or society, of habitués, who met every evening, for a pipe and a cheerful glass."

verb

• (transitive) To hit with a club.
  "He clubbed the poor dog."
• (intransitive) To join together to form a group.
  "Till grosser atoms, tumbling in the stream / Of fancy, madly met, and clubb'd into a dream."
• (intransitive, transitive) To combine into a club-shaped mass.
  "a medical condition with clubbing of the fingers and toes"
• (intransitive) To go to nightclubs.
  "We went clubbing in Ibiza."