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be a cuckoo
用于描述愚蠢的人，非正式且带贬义。
He is a cuckoo.
他是个笨蛋。
杜鹃；布谷鸟
cuckoos — plural of cuckoo
先理解核心含义，再看它在真实句子里的用法。
杜鹃；布谷鸟
A bird of the family Cuculidae, especially the common cuckoo, known for laying its eggs in other birds' nests.
He is a cuckoo.
他是个笨蛋。
杜鹃鸟,尤其是布谷鸟
Any of various birds, of the family Cuculidae within the order Cuculiformes, famous for laying its eggs in the nests of other species; but especially a common cuckoo (Cuculus canorus), that has a characteristic two-note call.
一个愚蠢无能的男人
a man who is a stupid incompetent fool
布谷鸟的叫声
The sound of that particular bird.
许多欧洲和北美鸟类,具有尖翅和长尾
any of numerous European and North American birds having pointed wings and a long tail
Don't listen to that cuckoo; he has no idea what he's talking about.
别听那个傻瓜的；他根本不知道自己在说什么。
The boss thinks I'm a cuckoo for suggesting a new approach.
老板认为我建议新方法是傻瓜。
Those cuckoos in the meeting kept interrupting with irrelevant questions.
会议上的那些傻瓜不断地用无关的问题打断。
用于描述愚蠢的人，非正式且带贬义。
He is a cuckoo.
他是个笨蛋。
'call someone a cuckoo' 是冒犯性说法，应避免用于正式场合。
Don't call her a cuckoo.
别叫她笨蛋。
表达主观看法，同样具有侮辱性。
They think he is a cuckoo.
他们认为他是个笨蛋。
Not this
He is cuckoo.
Use this
He is a cuckoo.
cuckoo 在此义项中是名词，表示'傻瓜'，不能直接作表语形容词；必须加冠词 'a' 用作名词短语。
Not this
He cuckooed all day.
Use this
He was a cuckoo all day.
当表示'他是个傻瓜'时，应使用名词结构 'be a cuckoo'，而非动词形式，因为动词 cuckoo 另有含义。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
布谷鸟钟
The cuckoo clock chimed at noon.
布谷鸟钟在中午报时。
杜鹃的叫声
We heard the cuckoo's call in the forest.
我们在森林里听到了杜鹃的叫声。
杜鹃鸟
The cuckoo bird is known for laying its eggs in other birds' nests.
杜鹃鸟以将蛋产在其他鸟的巢中而闻名。
杜鹃蛋
The cuckoo's egg was found in a robin's nest.
在知更鸟的巢中发现了一枚杜鹃蛋。
听到杜鹃叫
I heard a cuckoo while walking in the woods.
我在树林里散步时听到了一只杜鹃在叫。
杜鹃迁徙
Cuckoo migration patterns are studied by ornithologists.
鸟类学家研究杜鹃的迁徙模式。
家中的不速之客；闯入者
The new manager is a cuckoo in the nest, always changing things without consulting anyone.
新经理是个不速之客，总是不和任何人商量就改变一切。
不切实际的幻想世界
The politician's promises are from cloud cuckoo land; they can never be realized.
那位政客的承诺来自不切实际的幻想世界，永远无法实现。
我为可可泡芙疯狂！
He's completely cuckoo for that new video game.
他对那款新电子游戏完全疯狂了。
飞越疯人院
The film 'One Flew Over the Cuckoo's Nest' is a classic.
电影《飞越疯人院》是一部经典之作。
发长 /uː/ 音 (如 food, boot)
Use cuckoos naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
cuckoo有布谷鸟和傻瓜两意，联想其叫声之单调，犹如傻瓜之言。
语域：informal 常见场景：口语、俚语、贬低他人 该用法通常为非正式口语，带有贬义，多用于形容某人愚蠢无能。
Words like 'bamboo', 'kangaroo', and 'taboo' share the same ending sound /-uː/ with 'cuckoo', but their stressed vowels differ.
Dictionary facts from ECDICT, WIKTIONARY.
Watch the sound change