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the thin hard layer covering the outer tip of the fingers or toes 指甲；趾甲 
Extra ExamplesTopics Bodyb1He screamed as she dug her nails into his shoulders. 她的指甲抠进他的肩膀时，他大叫起来。 I bite my nails when I'm nervous. 我紧张时会咬指甲。 I was trying to grow my nails. 我那会儿正要把指甲留长。 I wore acrylic nails for two months. 我接水晶指甲有两个月时间。 She painted her nails bright red. 她把指甲涂成鲜红色。 There was dirt under his nails. 他的指甲缝里有污垢。
Oxford Collocations Dictionaryadjective- long
- short
- sharp
- …
- bite
- chew
- do
- …
- grow
- break
- split
- …
- care
- brush
- clippers
- …
- under your nail
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a small thin pointed piece of metal with a flat head, used for joining pieces of wood together or hanging things on a wall 钉；钉子 
Collocations Decorating and home improvementcompare screw, tackDecorating and home improvement 装饰和改善房屋 Houses 房屋 - refurbish/renovate/ (British English) do up a building/a house
整修／翻新／修缮楼房／房屋 - convert a building/house/room into homes/offices/(especially North American English) apartments/(British English) flats
把楼房／房子／房间／改建成住房／办公室／公寓 - extend/enlarge a house/building/room/kitchen
扩建／扩大房屋／楼房／房间／厨房 - build (British English) an extension (to the back/rear of a house)/(North American English) an addition (on/to something)/(British English) a conservatory
（在房子后面）扩建；（在某处）增建；建造暖房 - knock down/demolish a house/home/building/wall
推倒／拆除房子／住房／楼房／墙壁 - knock out/through the wall separating two rooms
将两个房间的隔墙打通
Decoration 装饰 - furnish/paint/ (especially British English) decorate a home/a house/an apartment/a flat/a room
布置／油漆／装饰住房／房子／公寓／房间 - be decorated in bright colours/in a traditional style/with flowers/with paintings
- paint/plaster the walls/ceiling
给墙壁／天花板上刷油漆／抹灰 - hang/put up/strip off/remove the wallpaper
贴／去除墙纸 - install/replace/remove the bathroom fixtures/(British English) fittings
安装／更换／拆除浴室的固定装置／附加设备 - build/put up shelves
搭架子 - lay wooden flooring/timber decking/floor tiles/a carpet/a patio
铺设木地板／平台木板／地砖／地毯／露台 - put up/hang/take down a picture/painting/poster/curtain
挂上／取下图画／绘画／海报／帘子
DIY/home improvement 自己动手；房屋改造 - do (British English) DIY/carpentry/the plumbing/the wiring
自己动手做；做木匠活；铺设管道；铺设线路 - make home improvements
改造房屋 - add/install central heating/underfloor heating/insulation
添加／安装中央供暖系统／地暖系统／隔热材料 - fit/install double-glazing/a smoke alarm
安装双层玻璃／烟雾报警器 - insulate your house/your home/the walls/the pipes/the tanks/(especially British English) the loft
在房子／住房／墙壁／管道／热水箱／阁楼里加隔热装置 - fix/repair a roof/a leak/a pipe/the plumbing/a leaking (especially British English) tap/(North American English usually) faucet
维修房顶／裂缝／管子／管道系统／漏水的水龙头 - block/clog (up)/unblock/unclog a pipe/sink
堵住／疏通管道／洗涤池 - make/drill/fill a hole
开／钻／填一个洞 - hammer (in)/pull out/remove a nail
锤进／拔出钉子 - tighten/untighten/loosen/remove a screw
拧紧／拧松／拧开螺丝钉 - saw/cut/treat/stain/varnish/paint wood
锯／切割／加工木料；给木料上色／上清漆／上油漆
Oxford Collocations Dictionaryadjective- long
- small
- six-inch
- …
- drive
- hammer
- knock
- …
- stick out
- stick up
- head
- hole
- bomb
- …
- refurbish/renovate/ (British English) do up a building/a house
Word OriginOld English nægel (noun), næglan (verb), of Germanic origin; related to Dutch nagel and German Nagel, from an Indo-European root shared by Latin unguis and Greek onux.
Idioms
fight tooth and nail
(as) hard as nails
showing no fear, sympathy or kind behaviour 冷酷无情；铁石心肠；毫无惧色
hit the nail on the head
to say something that is exactly right 说到点子上；正中要害
a nail in somebody’s/something’s coffin
something that makes the end or failure of an organization, somebody’s plans, etc. more likely to happen 导致失败的事物；导致某事终结之物 This latest defeat is another nail in the government's coffin. 最近的这次失败是政府又一次失败。
on the nail
(as) tough as old boots | (as) tough as nails (informal)
very strong and able to deal successfully with difficult conditions or situations 很强壮；坚韧不拔；雷打不动 She's almost 90 but she's still as tough as nails. 没有哪个学生真正喜欢这个新来的老师，说真的，大家都挺害怕他的。
More Like This Similes in idiomsSimiles in idioms- (as) bald as a coot
- (as) blind as a bat
- (as) bright as a button
- (as) bold as brass
- as busy as a bee
- as clean as a whistle
- (as) dead as a/the dodo
- (as) deaf as a post
- (as) dull as ditchwater
- (as) fit as a fiddle
- as flat as a pancake
- (as) good as gold
- (as) mad as a hatter/a March hare
- (as) miserable/ugly as sin
- as old as the hills
- (as) pleased/proud as Punch
- as pretty as a picture
- (as) regular as clockwork
- (as) quick as a flash
- (as) safe as houses
- (as) sound as a bell
- (as) steady as a rock
- (as) thick as two short planks
- (as) tough as old boots