#fault.serve  (tennis or badminton or squash) a serve that is illegal (e.g., that lands outside the prescribed area); "he served too many double faults"
  supertype:  #serve__service  a stroke (in tennis or badminton or squash) that puts the ball in play; "his powerful serves won the game"
  subtype:  #double_fault  (tennis) two successive faults in serving resulting in the loss of the point
  subtype:  #footfault  a fault that occurs when the server in tennis fails to keep both feet behind the baseline

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