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a peacock's tail
peacock 指雄孔雀；雌孔雀是 peahen。
The peacock's tail has bright blue and green feathers.
孔雀的尾巴有鲜亮的蓝绿色羽毛。
孔雀
先理解核心含义，再看它在真实句子里的用法。
孔雀
the male peafowl, with a crested head and a large fanlike tail marked with iridescent spots
The peacock's tail has bright blue and green feathers.
孔雀的尾巴有鲜亮的蓝绿色羽毛。
特指雄孔雀；雌孔雀为 peahen。
雄孔雀,尤指其尾羽绚丽多彩、具眼斑
A male peafowl, especially Pavo cristatus, notable for its brilliant iridescently ocellated tail.
孔雀(孔雀属或刚果孔雀属),不论雄雌
A peafowl (of the genus Pavo or Afropavo), either male or female.
孔雀肉
The meat of this bird.
虚荣自负的人
A pompous or vainglorious person [from the 14th c.].
The peacock spread its brilliant blue and green tail feathers in the zoo.
孔雀在动物园里展开了它那鲜艳的蓝绿色尾羽。
We watched a peacock strut across the lawn at the garden party.
我们在花园派对上看着一只孔雀神气活现地走过草坪。
The park is home to several peacocks that roam freely near the lake.
公园里有几只孔雀，它们在湖边自由漫步。
peacock 指雄孔雀；雌孔雀是 peahen。
The peacock's tail has bright blue and green feathers.
孔雀的尾巴有鲜亮的蓝绿色羽毛。
此处 peacock 比喻爱慕虚荣、好炫耀的人。
He is a peacock, always showing off his expensive watch.
他是个爱炫耀的人，总是炫耀他那块昂贵的手表。
动词 peacock 为非正式用法，常含贬义，表示炫耀、招摇；后可接 around/about。
The manager peacocked around the office after the deal.
经理谈成那笔交易后，在办公室里神气活现地走来走去。
peacock butterfly 指孔雀蛱蝶，是一种蝴蝶，与孔雀无关。
A peacock butterfly has a purple eyespot on each wing.
孔雀蛱蝶的每只翅膀上都有一个紫色眼斑。
Not this
There are many peacock in the park.
Use this
There are many peacocks in the park.
英语中 peacock 是可数名词，复数形式为 peacocks；汉语“孔雀”不区分单复数，但 many 后必须加可数名词复数，所以这里要用 peacocks。
Not this
I saw a brown peacock at the farm.
Use this
I saw a brown peahen at the farm.
英语 peacock 专指雄性孔雀，雌性孔雀应为 peahen；汉语“孔雀”不区分性别，所以指褐色、无长尾的雌性个体时不能用 peacock，要用 peahen。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
骄傲得像只孔雀；极其骄傲
He was proud as a peacock when he received the award.
他获奖时骄傲得像只孔雀。
孔雀羽毛
The dancer wore a peacock feather in her hair.
舞者在头发上插了一根孔雀羽毛。
孔雀蓝（亮蓝绿色）
The kitchen cabinets are painted a shimmering peacock blue.
厨房的橱柜刷成了闪闪发亮的孔雀蓝色。
孔雀蛱蝶
A peacock butterfly rested on the sunny wall.
一只孔雀蛱蝶停在阳光照着的墙上。
炫耀；招摇过市
He loves to peacock around in his expensive sports car.
他喜欢开着他的昂贵跑车四处招摇。
极其骄傲；自鸣得意
After winning the award, he was as proud as a peacock.
获奖后，他得意洋洋。
非常虚荣；自命不凡
She spends hours looking in the mirror and is as vain as a peacock.
她花好几个小时照镜子，虚荣极了。
像孔雀一样趾高气扬地走；炫耀
He strutted like a peacock after getting the promotion.
升职后，他趾高气扬地走着。
我想看看你的孔雀。
This is the catchy chorus from Katy Perry's 2010 pop song 'Peacock', where she sings about showing off one's pride and beauty like the bird's fanned tail.
这是凯蒂·佩里2010年流行歌曲《孔雀》中朗朗上口的副歌，她在歌中唱到要像孔雀开屏一样炫耀自己的骄傲与美丽。
Use peacock naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
孔雀开屏像扇子，眼斑如豆；peacock 的 pea 读音像“皮”，可联想孔雀爱炫耀、像公鸡一样昂首阔步。
语域：mixed 常见场景：birdwatching / zoology contexts、informal conversations about showing off 作名词时通常指孔雀或孔雀蛱蝶，属于中性语域，多用于客观或书面描述；作动词（vi）表示‘炫耀、神气活现地行走’时，通常多用于口语，带有一定的贬义。请根据实际词性选择恰当语境。
pea、peak、peace、peach 的起始读音 /piː/ 与 peacock 的第一音节相同；cock 与 peacock 的末尾 /kɒk/ 相同。注意这些词并不与整个 peacock 押韵（押韵需从重读音节到结尾完全一致）。peacoat 拼写与 peacock 相似，但结尾读 /kəʊt/，与 /kɒk/ 不同。
Dictionary facts from ECDICT, OCTANOVE, WIKTIONARY.