こんな時英語でどう言うの〜？英会話辞典 ：　

「な」

ないがしろにする　：　Leave someone out. 
内心　：　At heart.   Deep down.   
なんでもない　：　There is still some (hope, chance, opportunity). 
ない物ねだり　：　Like asking for the moon.  
ないよりまし　：　Better than nothing.   
なお　：　 More.   Further.   
なおかつ　：　And yet.   
なお大切なものは　：　What is more important.  
なおまた　：　Besides.  
なお悪くなる　：　Get worse.  
なおさら　：　All the more.   Even more.   Even (happier, fatter, etc.)   
長い目で見る　：　In the long run.   
流し目を送る　：　Send a flirtatious glance.   
なかなか　：　Quite.   Rather.   
仲間割れ　：　Split up.   Argue.   
〜しながら　：　While ...ing. (While eating, etc.)　
〜ながら　（〜でも）：　Though.  
ながら族　：　Doing two things at once.   
仲を裂く　：　Come between (a man and wife, friends, etc.)　　
中を取る　：　Take the middle road.   
泣き落とす　：　Get one's way by crying.  
泣きたいくらいです　：　Makes me wanna cry.  
泣き寝入りする　：　Get over it.  Cry oneself to sleep.  
慰める　：　Comfort.   Cheer up.   
なくなっちゃった！　：　Gone !  Something is gone !  
なけなしの金　：　What little money one has.  
情けない　：　Pathetic.  
なじめない　：　Just not my thing.  
なだめすかす　：　Pacify someone.   
なだめる　：　Calm someone down.   
懐かしい　：　Makes me feel nostalgic.  Someone missed someone/something.  
納得する　：　Understand.   Be convinced.   
夏ばて　：　The summer blahs.   Heatstroke.  
〜など　：　And so on.   Et cetera.   
何言ってるの？　：　What are you saying ?  
何言ってんだよ〜！　：　Dream on !  Don't kid yourself !  
何が言いたいの〜？　：　What's your point ?  What are you getting at ?   
何か手伝うことはありませんか？　：　Anything I can do to help ?  
何が何でも　：　No matter what.   
何食わぬ顔　：　Look innocent.   Act as if nothing happened.   
なにげない　：　Casual.   Nonchalant.  
何はともあれ　：　In any case.  
生　：　Raw (onion, egg).  Fresh (fish, vegetables). Live (broadcast, music)　 
(なま)  Half done (cooking).  Still damp (laundry).  Draft (beer).   
なまいき　：　Conceited.   Cocky.  
生かじり　：　Shallow knowledge.   
生臭い　：　Fishy-smelling.   
怠け者　：　A lazybones.   
なまぬるい　：　Go too easy on.   Be not strict enough with.   
生返事　：　A vague reply.   
なまりがある　：　Have an accent.  
涙もろい　：　Cry easily.  Be easily moved to tears.   
涙をのむ　：　Fight back tears.   
なめるな〜！　：　Don't mess with me !  Don't fuck with me !  
悩みの種　：　The root of one's troubles.   
なりふりかまわず　：　Despite how it might appear (to others).  
成り行きに任せる　：　Wait and see (what happens).   Let it ride.  
なる　：　Become. (Become a doctor.)  
(大人に)なる　：　Come of age.  
(十歳に)なったばかり　：　I just turned ten.  
(好きに)なる　：　Fall in love.   
(本当に)なる　：　Come true.  
(よく)なる　：　Get better.  
なるべく　：　As ... as  possible.  (fast, much, early etc).  
なるほど〜　：　Is that so ?   I see.   Indeed !  
なれあい　：　Plot together.  
慣れてくると　：　Once one gets used to it.   
なれなれしい　：　Too familiar.   Too chummy.   
慣れる　：　Get used to someone or something.  
なんだったら　：　If you don't mind.  
何だって？　：　What did you say ?  Come again ?  What's that ?  
なんちゃって　：　What am I saying ?   What a joke !  
何とすごい〜！　：　What a ... ! (sunset)    How .... !   　
何でもいいよ〜　：　Anything's Okay.  
何でもないよ　：　Nothing, really.   
（誰が）何と言っても　：　No matter what someone says.   
何とかしてよ〜　：　Do something !  
何とかします　：　Do something.  Do one's best.  
何とかなるよ　：　Someone will manage it.  Someone will work it out.   
何とかやってみる　：　See what can be done.  
なんとなく　：　Somehow. 
何とも言えないな〜　：　Can't tell yet.   Hard to say.   
何なら　：　If you want.  If you like.  If you wish.   
ナンパする　：　Look for action.   Go trolling.   

 　

このコーナーは「講談社文庫」の「こんな時どう言う英会話辞典」（長村キット著）
から抜粋させて頂きました。
この本には役に立つフレーズが満載です。読み物としても面白いですよ〜！