HOOP

[noun] [C] - a ring of wood, metal or plastic, or sometimes a half ringThe dogs had been trained to jump through hoops.The bride walked under an arch of hoops (= half rings) covered with flowers.A hoop (earring) is a ring-shaped earring.She wore large gold hoops and a thin gold necklace.If you put someone through (the) hoop(s), you make them do something difficult.