#waiting_line__waitingline__queue  a line of people or vehicles waiting for something
  supertype:  line.formation  a formation of people or things one behind another; "the line stretched clear around the corner"; "you must wait in a long line at the checkout counter"
  subtype:  breadline__bread_line__breadline  a queue of people waiting for free food
  subtype:  checkout_line  a queue of people waiting to pay for purchases
  subtype:  chow_line  a queue of people waiting for food to be served (especially at a military camp)
  subtype:  gas_line.waiting_line__gasline  a queue of vehicles waiting to purchase gasoline
  subtype:  reception_line__receptionline  a line of people (hosts and guests of honor) who welcome the guests at a reception party
  subtype:  ticket_line  a queue of people waiting to buy tickets
  subtype:  unemployment_line  a queue of people waiting for employment

No statement uses or specializes waiting_line; click here to add one.