Nuzzle up to (someone or something)
To nestle or cuddle against someone or something (especially with your nose or face).The puppy nuzzled up to his owner.
Nutty as a fruitcake
To be very crazy.The woman who lives next door is nutty as a fruitcake.
Nuts and bolts (of something)
The basic facts about something.The nuts and bolts of the housing loan were carefully discussed by the bank and their client.
Nuts about (someone or something)
To be enthusiastic about something.The man has been nuts about cars since he was a little boy.
Nurse (someone) back to health
To give someone care to restore him or her to good health.My mother spent several weeks with my grandmother trying to nurse her back to health.
Nurse a grudge
To keep a feeling of dislike toward someone.My old boyfriend is still nursing a grudge toward me after three years.
Number one
Oneself, one`s own interests.The man is always looking out for number one and he will never do anything for other people.
A number of things or people
An indefinite number of things or people.There were a number of reasons why I did not want to study at my father's university.
Null and void
Not valid, canceled.The credit card was null and void and I was unable to use it on my holiday.
Nowhere near
Not nearly.There were nowhere near enough chairs for all of the people who planned to come to the meeting.