1 [C] the part at the end of the body of an animal, bird, fish, etc 尾；尾巴: The dog barked and wagged its tail. 那只狗一面叫，一面摇着尾巴。 ☞pictures at horse, otter and scorpion 见horse、otter及scorpion插图

2 [C] the back part of an aircraft, spacecraft, etc （飞机、航天器等的）尾部 ☞picture at plane 见plane插图

3 tails [pl] a man's formal coat that is short at the front but with a long, divided piece at the back, worn especially at weddings 燕尾服（男子在正式场合尤其在婚礼上穿的服装）

4 tails [pl] the side of a coin that does not have the head of a person on it 硬币的背面（没有人头像的一面）: ‘We'll toss a coin to decide,’ said my father. ‘ Heads or tails ?’ “我们掷硬币决定，”父亲说。“你猜是正面还是反面？”

5 [C] (informal 非正式) a person who is sent to follow sb secretly to get information about him/her 钉梢人；尾巴