- [countable]
a hard pointed part that grows, usually in pairs, on the heads of some animals, such as sheep and cows. Horns are often curved. （羊、牛等动物的）角 
a large bull with curved horns 长着弯曲犄角的大公牛
Oxford Collocations Dictionaryadjective- buffalo
- bull’s
- cow’s
- …
- [uncountable]
the hard substance of which animal horns are made 角质 ornaments made of rhino horn 犀牛角制成的装饰品
Oxford Collocations Dictionaryadjective- buffalo
- bull’s
- cow’s
- …
- [countable]
a device in a vehicle for making a loud sound as a warning or signal （车辆的）喇叭 
to honk your car horn 按响汽车喇叭 - (British English)
to sound/toot your horn 鸣喇叭 Behind him, a horn blared. 在他身后响起了刺耳的喇叭声。
Extra ExamplesTopics Transport by car or lorryc1He gave a furious blast on his horn. 他怒气冲冲地按响了汽车喇叭。 Impatient horn blasts began to sound behind him. 他的身后响起了不耐烦的汽车喇叭声。 Passing motorists honked their horns. 路过的司机都按响了喇叭。 She flashed her lights and honked her horn at the car in front. 她向前面的车闪了车灯，按了喇叭。
Oxford Collocations Dictionaryadjective- car
- beep
- blare
- blow
- …
- beep
- blare
- honk
- …
- blast
- on a/the horn
- [countable]
a simple musical instrument that consists of a curved metal tube that you blow into （乐器）号 a hunting horn 猎号
Oxford Collocations Dictionaryverb + horn- blow
- section
- (especially British English) (also French horn British and North American English)[countable]
a brass musical instrument that consists of a long tube curled around in a circle with a wide opening at the end （乐器）号 a horn concerto 法国号协奏曲
Oxford Collocations Dictionaryverb + horn- blow
- section
Word OriginOld English, of Germanic origin; related to Dutch hoorn and German Horn, from an Indo-European root shared by Latin cornu and Greek keras.
Idioms
blow/toot your own horn (North American English)
(also blow your own trumpet especially in British English)
- (informal)
to praise your own abilities and achievements 自吹自擂
draw/pull your horns in
to start being more careful in your behaviour, especially by spending less money than before 行为检点；（尤指）减少开支 Small businesses have had to pull their horns in during the recession. 小企业在经济衰退期间不得不退出。
lock horns (with somebody) (over something)
to get involved in an argument with somebody 涉及（与某人的）争论（或争端、纠纷）
on the horns of a dilemma
in a situation in which you have to make a choice between things that are equally unpleasant 进退两难；左右为难 The medical profession’s eagerness for scientific advance had impaled it on the horns of a dilemma, forcing an unnatural choice between science and morality. 医学界对科学进步的渴望使其陷入两难境地，迫使其在科学和道德之间做出不自然的选择。 The dire economic situation had placed the prime minister on the horns of a dilemma. 严峻的经济形势使首相进退两难。
take the bull by the horns
to face a difficult or dangerous situation directly and with courage 勇敢面对困境（或险境） Nora decided to take the bull by the horns and organize things for herself. 诺拉决定挺身面对困难，由自己来安排事情。