a large ring of plastic, wood or iron 箍；环；圈 
The barrel was bound with three iron hoops. 那个桶用三个铁环箍住了。
- (also hoop earring)
an earring in the shape of a ring 圈状耳环 a pair of plain gold hoops 一对纯金环形耳环
the ring that the players throw the ball through in the game of basketball in order to score points （篮球）篮圈；篮筐 
- hoops[uncountable] (North American English, informal)
the game of basketball （篮球）篮圈；篮筐 He played junior college hoops in California. 他在加州打大专篮球。
a large ring that was used as a children’s toy in the past, or for animals or riders to jump through at a circus （旧时儿童玩的）大环子；（马戏团用的）大圈 - (also hula hoop, US English Hula-Hoop™)
a large plastic ring that you move in a circle around the middle part of your body by moving your hips 呼啦圈 a small arch made of metal or plastic, put into the ground （两端埋在地里的）小铁弓，小塑料弓 croquet hoops (= in the game of croquet) 槌球戏中的拱门 Grow lettuces under plastic stretched over wire hoops. 在铁弓撑起的塑料棚下种植生菜。
Word Originlate Old English hōp, of West Germanic origin; related to Dutch hoep.
Idioms
jump through hoops
to do something difficult or complicated in order to achieve something （为达到目的而）经受磨难 You have to jump through so many hoops to get a job like this. 要得到这样一份工作，你必须经历许多困难。