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A nail in one's coffin 催命符 (来源：英语麦当劳 http://www.EnglishCN.com)

nail someone down 敲定

nail to the pillory 钉在耻辱柱上

naked truth 赤裸裸的真实

A near friend is better than a far-dwelling kinsman. 远亲不如近友

The nearer the bone, the sweeter the flesh. 越是贴骨的肉越香

a near miss 接近成功的失败

Necessity is the mother of invention. 需要是发明之母

neck and neck 不分上下

neither fish nor fowl 不伦不类

Never bow to authority, but always tip your hat. 尊敬权威但不屈服于权威

Never hit a man when he is down. 切勿落井下石

Never offer to teach a fish to swim. 不要班门弄斧

Never put off till tomorrow what you may do today. 不要把今天能做的事拖到明天

never say die 不要悲观

New brooms sweep clean. 新官上任三把火

new wine in old bottles 旧瓶装新酒

Nightingales will not sing in a cage. 关在笼子里，夜莺也不叫

the nineteenth hole 高尔夫俱乐部的酒吧

No autumn fruit without spring blossoms. 没有春天花开，哪来秋天果满枝

No fire without smoke. 有火必有烟

No like is the same. 凡物都有差异

No man is born wise and learned. 人非生而知之

No man is happy but by comparison. 幸福是比较而言的

No man is wise at all times. 智者千虑，必有一失

No news is good news. 没有消息就是好消息

No one is a fool always, everyone sometimes. 没有终生的傻瓜，但人人会做傻事

No pains, no gains. 不劳责无获

no respecter of persons 一视同仁

No root, no fruit. 无根则无果

No rose without a thorn. 玫瑰皆有刺

No sweet without sweat. 没有汗水就没有甜蜜

not a leg to stand on 站不住脚

Nothing seek, nothing find. 无所求则无所获

Not to advance is to go back. 逆水行舟，不进则退

not to mention 更不用说

not turn a hair 不动声色

not worth the salt 无能；不称职

Nothing is difficult to the man who will try. 世上无难事，只要肯尝试

Nothing succeeds like success. 一事成功，事事顺利

Nothing venture, nothing have. 不入虎穴，焉得虎子

Nothing worse than a familiar enemy. 家贼难防