From full +‎ court.

fullcourt (not comparable)

1. (basketball) Of or pertaining to the entire basketball court.
   • 2009 March 26, Thayer Evans, “Missouri Thrives on Running Opponents Ragged”, in New York Times‎^[1]:

     Missouri does not employ fullcourt pressure all the time, but it uses varying defensive schemes to remain unpredictable.

• fullcourt press, full-court press, full court press